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SN 2011ht: Confirming a Class of Interacting Supernovae with Plateau
Light Curves (Type IIn-P): We present photometry and spectroscopy of the Type IIn supernova (SN) 2011ht,
identified previously as a SN impostor. The light curve exhibits an abrupt
transition from a well-defined ~120 day plateau to a steep bolometric... | astro-ph_SR |
On the rotation periods of the components of the triple system
TYC9300-0891-1AB/TYC9300-0529-1 in the Octans Association: Stellar rotation depends on different parameters. The range of values of
these parameters causes the dispersion in the rotation period distributions
observed in young stellar clusters/associations... | astro-ph_SR |
Unveiling the nature of red novae cool explosions using archive plate
photometry: Based on archive photographic photometry and recent CCD photometric data for
red novae V4332 Sgr and V838 Mon, we established their stellar composition,
exploded components, and the nature of explosions. Low temperature in the
outburst ... | astro-ph_SR |
Period-Colour and Amplitude-Colour relations for OGLE-$δ$ Scuti
stars in the Galactic Bulge and LMC: We present an analysis on the behaviour of the Galactic bulge and the Large
Magellanic Cloud (LMC) $\delta$ Scuti stars in terms of period-colour and
amplitude-colour (PCAC) relations at maximum, mean and minimum ligh... | astro-ph_SR |
Brightness Oscillations in Models of Young Binary Systems with Low-Mass
Secondary Components: We consider a model for the cyclic brightness variations of a young star with
a low-mass companion that accretes matter from the remnants of a protostellar
cloud. At small inclinations of the binary orbit to the line of sigh... | astro-ph_SR |
The $κ$-cookbook: a novel generalizing approach to unify
$κ$-like distributions for plasma particle modeling: In the literature different so-called $\kappa$-distribution functions are
discussed to fit and model the velocity (or energy) distributions of solar wind
species, pickup ions or magnetospheric particles. Here... | astro-ph_SR |
Two-sided-loop jets associated with magnetic reconnection between
emerging loops and twisted filament threads: Coronal jets are always produced by magnetic reconnection between emerging
flux and pre-existing overlying magnetic fields. When the overlying field is
vertical/obilique or horizontal, the coronal jet will a... | astro-ph_SR |
Survey of multiple populations in globular clusters among very low-mass
stars: Recent work has shown that NIR Hubble Space Telescope (HST) photometry allows
us to disentangle multiple populations (MPs) among M dwarfs of globular
clusters (GCs) and investigate this phenomenon in very low-mass (VLM) stars.
Here, we pre... | astro-ph_SR |
Data processing of Visible Emission Line Coronagraph Onboard ADITYA L1: ADITYA-L1 is India's first dedicated mission to observe the sun and its
atmosphere from a halo orbit around L1 point. Visible emission line coronagraph
(VELC) is the prime payload on board at Aditya-L1 to observe the sun's corona.
VELC is designed ... | astro-ph_SR |
A large stellar evolution database for population synthesis studies. V.
Stellar models and isochrones with CNONa abundance anticorrelations: We present a new grid of stellar models and isochrones for old stellar
populations, covering a large range of [Fe/H] values, for an heavy element
mixture characterized by CNONa ... | astro-ph_SR |
Chromospheric Activity in 55 Cancri: II. Theoretical Wave Studies versus
Observations: In this study, we consider chromospheric heating models for 55 Cancri in
conjunction with observations. The theoretical models, previously discussed in
Paper I, are self-consistent, nonlinear and time-dependent ab-initio
computatio... | astro-ph_SR |
Exploring B4: A Pulsating sdB star, in a Binary, in the Open Cluster NGC
6791: We report on Kepler photometry of the hot sdB star B4 in the open cluster NGC
6791. We confirm that B4 is a reflection effect binary with an sdB component
and a low-mass main sequence companion with a circular 0.3985 d orbit. The sdB
star ... | astro-ph_SR |
Metallicities from high resolution spectra of 49 RR Lyrae Variables: Accurate metallicities of RR Lyrae are extremely important in constraining
period-luminosity-metallicity relationships (PLZ), particularly in the
near-infrared. We analyse 69 high-resolution spectra of Galactic RR Lyrae stars
from the Southern African... | astro-ph_SR |
Observation of "Topological" Microflares in the Solar Atmosphere: We report on observation of the unusual kind of solar microflares, presumably
associated with the so-called "topological trigger" of magnetic reconnection,
which was theoretically suggested long time ago by Gorbachev et al. (Sov. Ast.
1988, v.32, p.308) ... | astro-ph_SR |
Investigation of the Progenitors of the Type Ia Supernovae Associated
With the LMC Supernova Remnants 0505-67.9 and 0509-68.7: Although Type Ia supernovae have been heavily scrutinized due to their use in
making cosmological distance estimates, we are still unable to definitively
identify the progenitors for the enti... | astro-ph_SR |
Models for Metal-Poor Stars with Different Initial Abundances of C, N,
O, Mg, and Si. III. Grids of Isochrones for $-2.5 \le$ [Fe/H] $\le -0.5$ and
Helium Abundances $Y = 0.25$ and $0.29$ at Each Metallicity: Stellar evolutionary tracks for $0.12 \le M/M_\odot \le 1.0$ have been
computed for each of several variati... | astro-ph_SR |
Towards solar measurements of nuclear reaction rates: Nuclear reaction rates are a fundamental yet uncertain ingredient in stellar
evolution models. The astrophysical S-factor pertaining to the initial reaction
in the proton-proton chain is uncertain at the 1% level, which contributes a
systematic but generally unpropa... | astro-ph_SR |
Revisiting the Cygnus OB associations: OB associations play an important role in Galactic evolution, though their
origins and dynamics remain poorly studied, with only a small number of systems
analysed in detail. In this paper we revisit the existence and membership of
the Cygnus OB associations. We find that of the h... | astro-ph_SR |
A stellar relic filament in the Orion star forming region: We report the discovery of the oldest stellar substructure in the Orion star
forming region (OSFR), the Orion relic filament. The relic filament is
physically associated with the OSFR as demonstrated by Gaia DR2 photometry and
astrometry, as well as targeted ra... | astro-ph_SR |
Detailed opacity calculations for astrophysical applications: Nowadays, several opacity codes are able to provide data for stellar
structure models, but the computed opacities may show significant differences.
In this work, we present state-of-the-art precise spectral opacity
calculations, illustrated by stellar applic... | astro-ph_SR |
A $ΔR\sim 9.5$ mag Super Flare of An Ultracool Star Detected by
$\text{SVOM/GWAC}$ System: In this paper, we report the detection and follow-ups of a super stellar
flare GWAC\,181229A with an amplitude of $\Delta R\sim$9.5 mag on a M9 type
star by $\text{SVOM/GWAC}$ and the dedicated follow-up telescopes. The
estimat... | astro-ph_SR |
Extended radio emission associated with a breakout eruption from the
back side of the Sun: Context. Coronal mass ejections (CMEs) on the Sun are the largest explosions
in the Solar System that can drive powerful plasma shocks. The eruptions,
shocks, and other processes associated to CMEs are efficient particle
accele... | astro-ph_SR |
Spectroscopic subsystems in nearby wide binaries: Radial velocity (RV) monitoring of solar-type visual binaries has been
conducted at the CTIO/SMARTS 1.5-m telescope to study short-period systems.
Data reduction is described, mean and individual RVs of 163 observed objects
are given. New spectroscopic binaries are disc... | astro-ph_SR |
A catalogue of 323 cataclysmic variables from LAMOST DR6: In this work, we present a catalog of cataclysmic variables (CVs) identified
from the Sixth Data Release (DR6) of the Large Sky Area Multi-Object Fiber
Spectroscopic Telescope (LAMOST). To single out the CV spectra, we introduce a
novel machine-learning algorith... | astro-ph_SR |
Forward asteroseismic modeling of stars with a convective core from
gravity-mode oscillations: parameter estimation and stellar model selection: We propose a methodological framework to perform forward asteroseismic
modeling of stars with a convective core, based on gravity-mode oscillations.
These probe the near-cor... | astro-ph_SR |
The Gaia DR1 Mass-Radius Relation for White Dwarfs: The Gaia Data Release 1 (DR1) sample of white dwarf parallaxes is presented,
including 6 directly observed degenerates and 46 white dwarfs in wide binaries.
This data set is combined with spectroscopic atmospheric parameters to study
the white dwarf mass-radius relati... | astro-ph_SR |
Sunspot splitting triggering an eruptive flare: We investigate how the splitting of the leading sunspot and associated flux
emergence and cancellation in active region NOAA 11515 caused an eruptive M5.6
flare on 2012 July 2. Our study employs multi-wavelength observations from HMI,
AIA and ChroTel. Emerging flux formed... | astro-ph_SR |
High Resolution Optical and NIR Spectra of HBC 722: We present the results of high resolution (R$\ge$30,000) optical and near-IR
spectroscopic monitoring observations of HBC 722, a recent FU Orionis object
that underwent an accretion burst in 2010. We observed HBC 722 in
optical/near-IR with the BOES, HET-HRS, and IGRI... | astro-ph_SR |
OH maser toward IRAS 06056+2131: polarization parameters and evolution
status: We present high angular resolution observations of OH maser emission towards
the high-mass star forming region IRAS 06056+2131. The observations were
carried out using the UK radio interferometer array, Multi-Element Radio Linked
Interfero... | astro-ph_SR |
The Mass of the Compact Object in the X-Ray Binary Her X-1/HZ Her: We have obtained the first estimates of the masses of the components of the
Her X-1/HZ Her X-ray binary system taking into account non-LTE effects in the
formation of the H_gamma absorption line: mx=1.8Msun and mv=2.5Msun. These mass
estimates were made... | astro-ph_SR |
Chemical mixing in low mass stars: I. Rotation against atomic diffusion
including radiative accelerations: When modelling stars with masses larger than 1.2Msun with no observed
chemical peculiarity, atomic diffusion is often neglected because, on its own,
it causes unrealistic surface abundances compared with those o... | astro-ph_SR |
Correlation between the optical veiling and accretion properties: A case
study of the classical T Tauri star DK Tau: Classical T Tauri stars (cTTs) accrete from their circumstellar disk. The
material falls onto the stellar surface, producing an accretion shock, which
generates veiling in a star's spectra. In addition... | astro-ph_SR |
Coronal Polarization: We present an overview of the physical mechanisms responsible for the coronal
polarization at different wavelength regimes. We also review different
techniques using coronal polarization to determine various quantities necessary
for understanding the thermodynamic properties of the solar coronal p... | astro-ph_SR |
The first stars: CEMP--no stars and signatures of spinstars: (Abridged) The CEMP--no stars are "carbon-enhanced-metal-poor" stars that in
principle show no evidence of s-- and r--elements from neutron captures. We try
to understand the origin and nucleosynthetic site of their peculiar CNO,
Ne--Na, and Mg--Al abundances... | astro-ph_SR |
The Infrared Evolution of Dust in V838 Monocerotis: Luminous Red Variables (LRVs) are most likely eruptions that are the outcome
of stellar mergers. V838 Mon is one of the best-studied members of this class,
representing an archetype for stellar mergers resulting from B-type stars. As
result of the merger event, nova-l... | astro-ph_SR |
Candidate Coronagraphic Detections of Protoplanetary Disks around Four
Young Stars: We present potential detections of H-band scattered light emission around
four young star, selected from a total sample of 45 young stars observed with
the CIAO coronagraph of the Subaru telescope. Two CTTS, CI Tau and DI Cep, and
two... | astro-ph_SR |
An independent analysis of the brown dwarf atmosphere monitoring (BAM)
data: large-amplitude variability is rare outside the L/T transition: Observations of variability can provide valuable information about the
processes of cloud formation and dissipation in brown dwarf atmospheres. Here
we report the results of an ... | astro-ph_SR |
H2O Maser Polarization of the Water Fountains IRAS 15445-5449 and IRAS
18043-2116: We present the morphology and linear polarization of the 22-GHz H2O masers in
the high-velocity outflow of two post-AGB sources, d46 (IRAS 15445-5449) and
b292 (IRAS 18043-2116). The observations were performed using The Australia
Tele... | astro-ph_SR |
Basal magnetic flux and the local solar dynamo: The average unsigned magnetic flux density in magnetograms of the quiet Sun
is generally dominated by instrumental noise. Due to the entirely different
scaling behavior of the noise and the solar magnetic pattern it has been
possible to determine the standard deviation of... | astro-ph_SR |
Modelling convection in A star atmospheres. Bisectors and lineshapes of
HD108642: We present a code, VeDyn, for modelling envelopes and atmospheres of A to F
stars focusing on accurate treatment of convective processes. VeDyn implements
the highly sophisticated convection model of Canuto and Dubovikov (1998) but is
f... | astro-ph_SR |
M dwarf luminosity, radius, and $α$-enrichment from $I$-band
spectral features: Despite the ubiquity of M dwarfs and their growing importance to studies of
exoplanets, Galactic evolution, and stellar structure, methods for precisely
measuring their fundamental stellar properties remain elusive. Existing
techniques fo... | astro-ph_SR |
New Low-Mass Stars in the 25 Orionis Stellar Group and Orion OB1a
Sub-association from SDSS-III/BOSS Spectroscopy: The Orion OB1a sub-association is a rich low mass star (LMS) region. Previous
spectroscopic studies have confirmed 160 LMSs in the 25 Orionis stellar group
(25 Ori), which is the most prominent overdensi... | astro-ph_SR |
A Granulation "Flicker"-based Measure of Stellar Surface Gravity: In Bastien et al. (2013) we found that high quality light curves, such as
those obtained by Kepler, may be used to measure stellar surface gravity via
granulation-driven light curve "flicker". Here, we update and extend the
relation originally presented ... | astro-ph_SR |
Recipe for inferring sub-surface solar magnetism via local mode-coupling
using Slepian basis functions: Direct seismic imaging of sub-surface flow, sound-speed and magnetic field is
crucial for predicting flux tube emergence on the solar surface, an important
ingredient for space weather. The sensitivity of helioseis... | astro-ph_SR |
Quiet-Sun intensity contrasts in the near ultraviolet: We present high-resolution images of the Sun in the near ultraviolet spectral
range between 214 nm and 397 nm as obtained from the first science flight of
the 1-m Sunrise balloon-borne solar telescope. The quiet-Sun rms intensity
contrasts found in this wavelength ... | astro-ph_SR |
Observational and model analysis of a two-ribbon flare possibly induced
by a neighbouring blowout jet: In this paper, we present unique observations of a blowout coronal jet that
possibly triggered a two-ribbon confined C1.2 flare in a bipolar solar active
region NOAA 12615 on 2016 December 5. The jet activity initia... | astro-ph_SR |
The Gaia-ESO Survey: Carbon abundance in the Galactic thin and thick
disks: This paper focuses on carbon that is one of the most abundant elements in the
Universe and is of high importance in the field of nucleosynthesis and galactic
and stellar evolution. Even nowadays, the origin of carbon and the relative
importan... | astro-ph_SR |
Proton and electron temperatures in the solar wind and their
correlations with the solar wind speed: The heating and acceleration of the solar wind remains one of the fundamental
unsolved problems in heliophysics. It is usually observed that the proton
temperature $T_i$ is highly correlated with the solar wind speed ... | astro-ph_SR |
Exploring B4: A Pulsating sdB star, in a Binary, in the Open Cluster NGC
6791: We report on Kepler photometry of the hot sdB star B4 in the open cluster NGC
6791. We confirm that B4 is a reflection effect binary with an sdB component
and a low-mass main sequence companion with a circular 0.3985 d orbit. The sdB
star ... | astro-ph_SR |
Outbursts and stellar properties of the classical Be star HD 6226: The bright and understudied classical Be star HD 6226 has exhibited multiple
outbursts in the last several years during which the star grew a viscous
decretion disk. We analyze 659 optical spectra of the system collected from
2017-2020, along with a UV ... | astro-ph_SR |
Correlation between lithium abundances and ages of solar twin stars: We want to determine the lithium abundances of solar twin stars as a function
of stellar age to provide constraints for stellar evolutions models and to
investigate whether there is a connection between low Li abundance and the
occurrence of planets. ... | astro-ph_SR |
Simultaneous X-ray and Radio Observations of Rotating Radio Transient
J1819-1458: We present the results of simultaneous radio and X-ray observations of PSR
J1819-1458. Our 94-ks XMM-Newton observation of the high magnetic field 5*10^13
G pulsar reveals a blackbody spectrum (kT~130 eV) with a broad absorption
feature... | astro-ph_SR |
V405 Peg (RBS 1955): A Nearby, Low-Luminosity Cataclysmic Binary: (Abridged). The cataclysmic binary V405 Peg, originally discovered as ROSAT
Bright Source (RBS) 1955 (= 1RXS J230949.6+213523), shows a strong contribution
from a late-type secondary star in its optical spectrum, which led Schwope et
al. to suggest it to... | astro-ph_SR |
Warm Breeze from the starboard bow: a new population of neutral helium
in the heliosphere: We investigate the signals from neutral He atoms observed from Earth orbit in
2010 by IBEX. The full He signal observed during the 2010 observation season
can be explained as a superposition of pristine neutral interstellar He ... | astro-ph_SR |
Active region upflows: 1. Multi-instrument observations: Upflows at the edges of active regions (ARs) are studied by spatially and
temporally combining multi-instrument observations obtained with EIS/Hinode,
AIA and HMI/SDO and IBIS/NSO, to derive their plasma parameters. This
information is used for benchmarking data-... | astro-ph_SR |
HD66051: the first eclipsing binary hosting an early-type magnetic star: Early-type magnetic stars are rarely found in close binary systems. No such
objects were known in eclipsing binaries prior to this study. Here we
investigated the eclipsing, spectroscopic double-lined binary HD66051, which
exhibits out-of-eclipse ... | astro-ph_SR |
Direct MD simulation of liquid-solid phase equilibria for two-component
plasmas: We determine the liquid-solid phase diagram for carbon-oxygen and
oxygen-selenium plasma mixtures using two-phase MD simulations. We identified
liquid, solid, and interface regions using a bond angle metric. To study finite
size effects,... | astro-ph_SR |
On the role of tachoclines in solar and stellar dynamos: Rotational shear layers at the boundary between radiative and convective
zones, tachoclines, play a key role in the process of magnetic field generation
in solar-like stars. We present two sets of global simulations of rotating
turbulent convection and dynamo. Th... | astro-ph_SR |
No evidence of chemical anomalies in the bimodal turnoff cluster NGC
1806 in the LMC: We have studied the chemical composition of NGC 1806, a massive,
intermediate-age globular cluster that shows a double main sequence turnoff. We
analyzed a sample of high-resolution spectra (secured with FLAMES at the Very
Large Tel... | astro-ph_SR |
Rapidly varying A-type stars in the SuperWASP archive: The searches for transiting exoplanets have produced a vast amount of
time-resolved photometric data of many millions of stars. One of the leading
ground-based surveys is the SuperWASP project. We present the initial results
of a survey of over 1.5 million A-type s... | astro-ph_SR |
A census of Coronal Mass Ejections on solar-like stars: Coronal Mass Ejections (CMEs) may have major importance for planetary and
stellar evolution. Stellar CME parameters, such as mass and velocity, have yet
not been determined statistically. So far only a handful of stellar CMEs has
been detected mainly on dMe stars ... | astro-ph_SR |
Shock-Cloud Interaction in the Solar Corona: Flare associated coronal shock waves sometimes interact with solar
prominences leading to large amplitude prominence oscillations. Such prominence
activation gives us unique opportunity to track time evolution of shock-cloud
interaction in cosmic plasmas. Although the dynami... | astro-ph_SR |
The Pair-Instability Mass Gap for Black Holes: Stellar evolution theory predicts a "gap" in the black hole birth function
caused by the pair instability. Presupernova stars that have a core mass below
some limiting value, Mlo, after all pulsational activity is finished, collapse
to black holes, whereas more massive one... | astro-ph_SR |
Coevality in Young Eclipsing Binaries: The ages of the components in very short period pre-main sequence (PMS)
binaries are essential to an understanding of their formation. We considered a
sample of 7 PMS eclipsing binaries (EBs) with ages 1 to 6.3 MY and component
masses 0.2 to 1.4 Msun The very high precision with w... | astro-ph_SR |
Identification, mass and age of primary red clump stars from spectral
features derived with the LAMOST DR7: Although red clump (RC) stars are easy to identify due to their stability of
luminosity and color, about 20-50% are actually red giant branch (RGB) stars in
the same location on the HR diagram. In this paper, a... | astro-ph_SR |
The low-mass stellar mass functions of rich, compact clusters in the
Large Magellanic Cloud: Context. We use Hubble Space Telescope photometry of six rich, compact star
clusters in the Large Magellanic Cloud (LMC), with ages ranging from 0.01 to
1.0 Gyr, to derive the clusters' stellar mass functions (MFs) at their
h... | astro-ph_SR |
On the Lira law and the nature of extinction towards Type Ia Supernovae: We have studied the relation between the color evolution of Type Ia
Supernovae (SNe Ia) from maximum light to the Lira law regime and the presence
of narrow absorption features. Based on a nearby sample of 89 SNe Ia we have
found that the rate of ... | astro-ph_SR |
Stellar mid-life crisis: subcritical magnetic dynamos of solar-like
stars and the breakdown of gyrochronology: Recent observations reveal the surprising breakdown of stellar gyrochronology
relations at about the Sun's age hinting that middle-aged, solar-like stars
transition to a magnetically inactive future. We prov... | astro-ph_SR |
The GRAVITY Young Stellar Object survey -- I. Probing the disks of
Herbig Ae/Be stars in terrestrial orbits: The formation and the evolution of protoplanetary disks are important stages
in the lifetime of stars. The processes of disk evolution and planet formation
are intrinsically linked. We spatially resolve with G... | astro-ph_SR |
Evolution of the post merger remnants from the coalescence of
oxygen-neon and carbon-oxygen white dwarf pairs: Although multidimensional simulations have investigated the processes of
double WD mergers, post-merger evolution only focused on the carbon-oxygen (CO)
WD or helium (He) WD merger remnants. In this work, we... | astro-ph_SR |
FUV variability of HD 189733. Is the star accreting material from its
hot Jupiter?: Hot Jupiters are subject to strong irradiation from the host stars and, as a
consequence, they do evaporate. They can also interact with the parent stars by
means of tides and magnetic fields. Both phenomena have strong implications f... | astro-ph_SR |
G-band and Hard X-ray Emissions of the 2006 December 14 flare observed
by Hinode/SOT and RHESSI: We report on G-band emission observed by the Solar Optical Telescope onboard
the Hinode satellite in association with the X1.5-class flare on 2006 December
14. The G-band enhancements originate from the footpoints of flar... | astro-ph_SR |
Magnetic feature tracking, what determines the speed?: Recent observations revealed that small magnetic elements abundant at the
solar surface move poleward with a velocity which seems to be lower than the
plasma velocity $U_{\theta}$. Guerrero et al. (2011) explained this discrepancy
as a consequence of diffusive spre... | astro-ph_SR |
The AstraLux Multiplicity Survey: Extension to Late M-dwarfs: The distribution of multiplicity among low-mass stars is a key issue to
understanding the formation of stars and brown dwarfs, and recent surveys have
yielded large enough samples of nearby low-mass stars to study this issue
statistically to good accuracy. P... | astro-ph_SR |
J-type carbon stars: A dominant source of 14N-rich presolar SiC grains
of type AB: We report Mo isotopic data of 27 new presolar SiC grains, including 12
14N-rich AB (14N/15N>440, AB2) and 15 mainstream (MS) grains, and their
correlated Sr and Ba isotope ratios when available. Direct comparison of the
data for the MS... | astro-ph_SR |
Precision southern hemisphere VLBI pulsar astrometry II: Measurement of
seven parallaxes: Accurate measurement of pulsar distances via astrometry using very long
baseline interferometry enables the improvement of Galactic electron density
distribution models, improving distance estimates for the vast majority of
puls... | astro-ph_SR |
Triple evolution: an important channel in the formation of type Ia
supernovae: Type Ia supernovae (SNe Ia) are thought to be the result of thermonuclear
explosions in white dwarfs (WDs). Commonly considered formation pathways
include two merging WDs (the double degenerate channel), and a single WD
accreting material ... | astro-ph_SR |
Observation of flux tube crossings in the solar wind: Current sheets are ubiquitous in the solar wind.They are a major source of
the solar wind MHD turbulence intermittency. They may result from non-linear
interactions of the solar wind MHD turbulence or are the boundaries of flux
tubes that originate from the solar su... | astro-ph_SR |
Chromospheric swirls I. Automated detection in H$α$ observations
and their statistical properties: Chromospheric swirls are considered to play a significant role in the
dynamics and heating of the upper solar atmosphere. It is important to
automatically detect and track them in chromospheric observations and determin... | astro-ph_SR |
Evolved Massive Stars at Low-metallicity II. Red Supergiant Stars in the
Small Magellanic Cloud: We present the most comprehensive RSG sample for the SMC up to now, including
1,239 RSG candidates. The initial sample is derived based on a source catalog
for the SMC with conservative ranking. Additional spectroscopic R... | astro-ph_SR |
Primeval very low-mass stars and brown dwarfs - VI. Population
properties of metal-poor degenerate brown dwarfs: We presented 15 new T dwarfs that were selected from UKIRT Infrared Deep Sky
Survey, Visible and Infrared Survey Telescope for Astronomy, and Wide-field
Infrared Survey Explorer surveys, and confirmed with... | astro-ph_SR |
Twenty-Five Sub-Arcsecond Binaries Discovered By Lunar Occultations: We report on 25 sub-arcsecond binaries, detected for the first time by means
of lunar occultations in the near-infrared as part of a long-term program using
the ISAAC instrument at the ESO Very Large Telescope. The primaries have
magnitudes in the ran... | astro-ph_SR |
Derivations and Observations of Prominence Bulk Motions and Mass: In this chapter we review observations and techniques for measuring both bulk
flows in prominences and prominence mass. Measuring these quantities is
essential to development and testing of models discussed throughout this book.
Prominence flows are comp... | astro-ph_SR |
Saturation of large-scale dynamo in anisotropically forced turbulence: Turbulent dynamo theories have faced difficulties in obtaining evolution of
large-scale magnetic fields on short dynamical time-scales due to the
constraint imposed by magnetic helicity balance. This has critical implications
for understanding the l... | astro-ph_SR |
Mapping the Local Halo: Statistical Parallax Analysis of SDSS Low-Mass
Subdwarfs: We present a statistical parallax study of nearly 2,000 M subdwarfs with
photometry and spectroscopy from the Sloan Digital Sky Survey. Statistical
parallax analysis yields the mean absolute magnitudes, mean velocities and
velocity elli... | astro-ph_SR |
Type Ia Single Degenerate Survivors Must Be Overluminous: In the single-degenerate (SD) channel of a Type Ia supernovae (SN Ia)
explosion, a main-sequence (MS) donor star survives the explosion but it is
stripped of mass and shock heated. An essentially unavoidable consequence of
mass loss during the explosion is that ... | astro-ph_SR |
A Search for Interstellar Carbon Chain Alcohol HC4OH in Star-Forming
Region L1527 and Dark Cloud TMC-1: We report a sensitive search for the rotational transitions of the carbon
chain alcohol HC4OH in the frequency range of 21.2-46.7 GHz in the star-forming
region L1527 and the dark cloud TMC-1. The motivation was la... | astro-ph_SR |
Investigating Gaia EDR3 parallax systematics using asteroseismology of
Cool Giant Stars observed by Kepler, K2, and TESS I. Asteroseismic distances
to 12,500 red-giant stars: Gaia EDR3 has provided unprecedented data that generate a lot of interest in
the astrophysical community, despite the fact that systematics a... | astro-ph_SR |
Diffraction-limited Visible Light Images of Orion Trapezium Cluster With
the Magellan Adaptive Secondary AO System (MagAO): We utilized the new high-order (250-378 mode) Magellan Adaptive Optics system
(MagAO) to obtain very high spatial resolution observations in "visible light"
with MagAO's VisAO CCD camera. In the... | astro-ph_SR |
Models of Individual Blue Stragglers: This chapter describes the current state of models of individual blue
stragglers. Stellar collisions, binary mergers (or coalescence), and partial or
ongoing mass transfer have all been studied in some detail. The products of
stellar collisions retain memory of their parent stars a... | astro-ph_SR |
The quest for stable circumbinary companions to post-common envelope sdB
eclipsing binaries Does the observational evidence support their existence?: Context. Period variations have been detected in a number of eclipsing close
compact binary subdwarf B stars (sdBs) and these have often been interpreted as
caused by c... | astro-ph_SR |
Zeeman Doppler maps. II: the perils of eschewing physics: For the observational modeling of horizontal abundance distributions and of
magnetic geometries in chemically peculiar (CP) stars, Zeeman Doppler mapping
(ZDM) has become the method of choice. Comparisons between abundance maps
obtained for CP stars and predicti... | astro-ph_SR |
The Herschel Cold Debris Disks: Confusion with the Extragalactic
Background at 160 mu: The Herschel "DUst around NEarby Stars (DUNES)" survey has found a number of
debris disk candidates that are apparently very cold, with temperatures near
22K. It has proven difficult to fit their spectral energy distributions with
... | astro-ph_SR |
Survey of Nearby FGK Stars at 160 microns with Spitzer: The Spitzer Space Telescope has advanced debris disk science tremendously
with a wealth of information on debris disks around nearby A, F, G, K and M
stars at 24 and 70 microns with the MIPS photometer and at 8-34 microns with
IRS. Here we present 160 micron obser... | astro-ph_SR |
Binarity and Accretion in AGB Stars: HST/STIS Observations of UV
Flickering in Y Gem: Binarity is believed to dramatically affect the history and geometry of mass
loss in AGB and post-AGB stars, but observational evidence of binarity is
sorely lacking. As part of a project to search for hot binary companions to
cool ... | astro-ph_SR |
Magnetic field variations and the seismicity of solar active regions: Dynamical changes in the solar corona have proven to be very important in
inducing seismic waves into the photosphere. Different mechanisms for their
generation have been proposed. In this work, we explore the magnetic field
forces as plausible mecha... | astro-ph_SR |
Properties of ion-cyclotron waves in the open solar corona: Remote observations of coronal holes have strongly implicated the resonant
interactions of ion-cyclotron waves with ions as a principal mechanism for
plasma heating and acceleration of the fast solar wind. In order to study these
waves, a WKB (Wentzel-Kramers-... | astro-ph_SR |
A Multi-Survey Approach to White Dwarf Discovery: By selecting astrometric and photometric data from the Sloan Digital Sky
Survey (SDSS), the L{\'e}pine & Shara Proper Motion North Catalog (LSPM-North),
the Two Micron All Sky Survey (2MASS), and the USNO-B1.0 catalog, we use a
succession of methods to isolate white dwa... | astro-ph_SR |
Most Lithium-rich Low-mass Evolved Stars Revealed as Red Clump stars by
Asteroseismology and Spectroscopy: Lithium has confused scientists for decades at almost each scale of the
universe. Lithium-rich giants are peculiar stars with lithium abundances over
model prediction. A large fraction of lithium-rich low-mass e... | astro-ph_SR |
Characteristics of Flight Delays during Solar Flares: Solar flare is one of the severest solar activities on the sun, and it has
many important impacts on the near-earth space. It has been found that flight
arrival delays will increase during solar flare. However, the detailed
intrinsic mechanism of how solar flares in... | astro-ph_SR |
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