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Discovery of a Highly Eccentric, Chromospherically Active Binary:
ASASSN-V J192114.84+624950.8: As part of an All-Sky Automated Survey for SuperNovae (ASAS-SN) search for
sources with large flux decrements, we discovered a transient where the
quiescent, stellar source, ASASSN-V J192114.84+624950.8, rapidly decreased ... | astro-ph_SR |
CNO abundances in the globular clusters NGC 1851 and NGC 6752: We measure the C+N+O abundance sum in red giant stars in two Galactic
globular clusters, NGC 1851 and NGC 6752. NGC 1851 has a split subgiant branch
which could be due to different ages or C+N+O content while NGC 6752 is
representative of the least complex ... | astro-ph_SR |
Populations of rotating stars. - I. Models from 1.7 to 15 Msun at Z =
0.014, 0.006, and 0.002 with Ω/Ωcrit between 0 and 1: B-type stars are known to rotate at various velocities, including very fast
rotators near the critical velocity as the Be stars. In this paper, we provide
stellar models covering the mass range ... | astro-ph_SR |
SDSS/SEGUE Spectral Feature Analysis For Stellar Atmospheric Parameter
Estimation: Large-scale and deep sky survey missions are rapidly collecting a large
amount of stellar spectra, which necessitate the estimation of atmospheric
parameters directly from spectra and makes it feasible to statistically
investigate late... | astro-ph_SR |
PolarBase: a data base of high resolution spectropolarimetric stellar
observations: PolarBase is an evolving data base that contains all stellar data collected
with the ESPaDOnS and NARVAL high-resolution spectropolarimeters, in their
reduced form, as soon as they become public. As of early 2014, observations of
2,00... | astro-ph_SR |
Precise mass measurements for the double neutron star system J1829+2456: PSR J1829+2456 is a radio pulsar in a relativistic binary system with another
neutron star. It has a rotational period of 41 ms and a mildly eccentric ($e =
0.14$) 28-hr orbit. We have continued its observations with the Arecibo radio
telescope an... | astro-ph_SR |
The Effects of Space Weather on Flight Delays: Although the sun is really far away from us, some solar activities could
still influence the performance and reliability of space-borne and ground-based
technological systems on Earth. Those time-varying conditions in space caused
by the sun are also called space weather, ... | astro-ph_SR |
Extensive photometry of the intermediate polar V1033 Cas (IGR
J00234+6141): To measure the spin period of the white dwarf in V1033 Cas with high
precision, we performed extensive photometry. Observations were obtained over
34 nights in 2017. The total duration of the observations was 143 h. We found
that the spin per... | astro-ph_SR |
Discovery of a ~23 Mjup Brown Dwarf Orbiting ~700 AU from the Massive
Star HIP 78530 in Upper Scorpius: We present the discovery of a substellar companion on a wide orbit around the
~2.5 Msun star HIP 78530, which is a member of the 5 Myr-old Upper Scorpius
association. We have obtained follow-up imaging over two yea... | astro-ph_SR |
Statistical Study of Emerging Flux Regions and the Upper Atmosphere
Response: We statistically study the property of emerging flux regions (EFRs) and the
upper solar atmosphere response to the flux emergence by using data from the
Helioseismic and Magnetic Imager (HMI) and the Atmospheric Imaging Assembly
(AIA) on bo... | astro-ph_SR |
The quiet Sun at mm Wavelengths as Seen by ALMA: Solar observations at sub-mm, mm and cm wavelengths offer a straightforward
diagnostic of physical conditions in the solar atmosphere because they yield
measurement of brightness temperature which, for optically thick features,
equals intrinsic temperature - much unlike ... | astro-ph_SR |
Gravitational fragmentation and formation of giant protoplanets on
tens-of-au orbits: Migration of dense gaseous clumps that form in young protostellar disks via
gravitational fragmentation is investigated to determine the likelihood of
giant planet formation. High-resolution numerical hydrodynamics simulations in
th... | astro-ph_SR |
Detection of the 69 μm band of crystalline forsterite in the
Herschel MESS-program: In this article we present the detection of the 69 {\mu}m band of the
crystalline olivine forsterite within the MESS key program of Herschel. We
determine the temperature of the forsterite grains by fitting the 69 {\mu}m
band. | astro-ph_SR |
WIRED for EC: New White Dwarfs with $\textit{WISE}$ Infrared Excesses
and New Classification Schemes from the Edinburgh-Cape Blue Object Survey: We present a simple method for identifying candidate white dwarf systems with
dusty exoplanetary debris based on a single temperature blackbody model fit to
the infrared exc... | astro-ph_SR |
Radii of Rapidly-Rotating Stars, with Application to Transiting-Planet
Hosts: The currently favored method for estimating radii and other parameters of
transiting-planet host stars is to match theoretical models to observations of
the stellar mean density rho_*, the effective temperature T_eff, and the
composition pa... | astro-ph_SR |
Long-term forcing of Sun's coronal field, open flux and cosmic ray
modulation potential during grand minima, maxima and regular activity phases
by the solar dynamo mechanism: Magnetic fields generated in the Sun's interior by the solar dynamo mechanism
drive solar activity over a range of time-scales. While space-b... | astro-ph_SR |
Interactions of the magnetospheres of stars and close-in giant planets: Since the first discovery of an extrasolar planetary system more than a
decade ago, hundreds more have been discovered. Surprisingly, many of these
systems harbor Jupiter-class gas giants located close to the central star, at
distances of 0.1 AU or... | astro-ph_SR |
Helioseismology with Solar Orbiter: The Solar Orbiter mission, to be launched in July 2017, will carry a suite of
remote sensing and in-situ instruments, including the Polarimetric and
Helioseismic Imager (PHI). PHI will deliver high-cadence images of the Sun in
intensity and Doppler velocity suitable for carrying out ... | astro-ph_SR |
The Of?p stars of the Magellanic Clouds: Are they strongly magnetic?: All known Galactic Of?p stars have been shown to host strong, organized,
magnetic fields. Recently, five Of?p stars have been discovered in the
Magellanic Clouds. They posses photometric \citep{Naze} and spectroscopic
\citep{Walborn} variability comp... | astro-ph_SR |
COBRaS: The e-MERLIN 21 cm Legacy survey of Cygnus OB2: The role of massive stars is central to an understanding of galactic ecology.
It is important to establish the details of how massive stars provide
radiative, chemical, and mechanical feedback in galaxies. Central to these
issues is an understanding of the evoluti... | astro-ph_SR |
The characteristics of flare- and CME-productive solar active regions: Solar flares and coronal mass ejections (CMEs) cause immediate and adverse
effects on the interplanetary space and geospace. The deeper understanding of
the mechanisms that produce them and the construction of efficient prediction
schemes are of par... | astro-ph_SR |
CCD photometric study of the W UMa-type binary II CMa in the field of
Berkeley 33: The CCD photometric data of the EW-type binary, II CMa, which is a contact
star in the field of the middle-aged open cluster Berkeley 33, are presented.
The complete R light curve was obtained. In the present paper, using the five
CCD ... | astro-ph_SR |
Transition region contribution to AIA observations in the context of
coronal heating: We investigate the relative contributions from the transition region and
corona of coronal loops observed by the Atmospheric Imaging Assembly (AIA) on
the Solar Dynamics Observatory (SDO). Using EBTEL (Enthalpy-Based Thermal
Evoluti... | astro-ph_SR |
Transition region contribution to AIA observations in the context of
coronal heating: We investigate the relative contributions from the transition region and
corona of coronal loops observed by the Atmospheric Imaging Assembly (AIA) on
the Solar Dynamics Observatory (SDO). Using EBTEL (Enthalpy-Based Thermal
Evoluti... | astro-ph_SR |
Rapid Changes of Photospheric Magnetic Field after Tether-Cutting
Reconnection and Magnetic Implosion: The rapid, irreversible change of the photospheric magnetic field has been
recognized as an important element of the solar flare process. This Letter
reports such a rapid change of magnetic fields during the 2011 Fe... | astro-ph_SR |
Red giants seismology: The space-borne missions CoRoT and Kepler are indiscreet. With their
asteroseismic programs, they tell us what is hidden deep inside the stars.
Waves excited just below the stellar surface travel throughout the stellar
interior and unveil many secrets: how old is the star, how big, how massive,
h... | astro-ph_SR |
Characterization of mid-infrared polarization due to scattering in
protoplanetary disks: It is generally assumed that magnetic fields play an important role in the
formation and evolution of protoplanetary disks. One way of observationally
constraining magnetic fields is to measure polarized emission and absorption
p... | astro-ph_SR |
Mass loss from inhomogeneous hot star winds I. Resonance line formation
in 2D models: Small-scale clumping in the winds of hot, massive stars is conventionally
included in spectral analyses by assuming optically thin clumps, a void
inter-clump medium, and a smooth velocity field. To reconcile investigations of
differ... | astro-ph_SR |
Intermediate Resolution Near-Infrared Spectroscopy of 36 late-M Dwarfs: We present observations of 36 late-M dwarfs obtained with the KeckII/NIRSPEC
in the J-band at a resolution of \sim20,000. We have measured projected
rotational velocities, absolute radial velocities, and pseudo-equivalent widths
of atomic lines. 12... | astro-ph_SR |
Rotational studies in the Orion Nebula Cluster: from solar mass stars to
brown dwarfs: Rotational studies at a variety of ages and masses are important for
constraining the angular momentum evolution of young stellar objects (YSO). Of
particular interest are the very low mass (VLM) stars and brown dwarfs (BDs),
becau... | astro-ph_SR |
Empirical Estimate of the Shape of the Upstream Heliopause from IBEX-Lo
Helium Measurements: Preliminary Results: We present a simplified model of the outer heliosheath to help interpret the
observations of interstellar neutral helium by the IBEX-Lo instruments. We
assume that the measured particles are composed of t... | astro-ph_SR |
Intensity contrast from MHD simulations and from HINODE observations: Changes in the solar surface area covered by small-scale magnetic elements
are thought to cause long-term changes in the solar spectral irradiance, which
are important for determining the impact on Earth's climate. To study the
effect of small-scale ... | astro-ph_SR |
Spectral Classification; Old and Contemporary: Beginning with a historical account of the spectral classification, its
refinement through additional criteria is presented. The line strengths and
ratios used in two dimensional classifications of each spectral class are
described. A parallel classification scheme for met... | astro-ph_SR |
The dynamical importance of binary systems in young massive star
clusters: Characterization of the binary fractions in star clusters is of fundamental
importance for many fields in astrophysics. Observations indicate that the
majority of stars are found in binary systems, while most stars with masses
greater than $0.... | astro-ph_SR |
The Mouse that Squeaked: A small flare from Proxima Cen observed in the
millimeter, optical, and soft X-ray with Chandra and ALMA: We present millimeter, optical, and soft X-ray observations of a stellar
flare with an energy squarely in the regime of typical X1 solar flares. The
flare was observed from Proxima Cen on... | astro-ph_SR |
The evolutionary state of the chemically peculiar members of the open
cluster NGC2516: We aim at establishing safe membership and evolutionary status of 11
chemically peculiar (CP) stars that are residing in the domain of the open
cluster NGC2516 and are frequently referred to as cluster members. We queried
the Gaia ... | astro-ph_SR |
KIC 4142768: An Evolved Gamma Doradus/Delta Scuti Hybrid Pulsating
Eclipsing Binary with Tidally Excited Oscillations: We present the characterization of KIC 4142768, an eclipsing binary with two
evolved A-type stars in an eccentric orbit with a period of 14 days. We measure
the fundamental parameters of the two comp... | astro-ph_SR |
Amplitude and lifetime of radial modes in red giant star spectra
observed by Kepler: Context: the space-borne missions CoRoT and Kepler have provided photometric
observations of unprecedented quality. The study of solar-like oscillations
observed in red giant stars by these satellites allows a better understanding
of... | astro-ph_SR |
Solar Simulations for the Atacama Large Millimeter Observatory Network: The Atacama Large Millimeter/submillimeter Array (ALMA) will be a valuable
tool for observing the chromosphere of our Sun at (sub-)millimeter wavelengths
at high spatial, temporal and spectral resolution and as such has great
potential to address l... | astro-ph_SR |
The FERRUM project: laboratory-measured transition probabilities for Cr
II: Aims: We measure transition probabilities for Cr II transitions from the z
^4H_J, z ^2D_J, y ^4F_J, and y ^4G_J levels in the energy range 63000 to 68000
cm^{-1}. Methods: Radiative lifetimes were measured using time-resolved
laser-induced fl... | astro-ph_SR |
The polluted atmosphere of the white dwarf NLTT 25792 and the diversity
of circumstellar environments: We present an analysis of X-Shooter spectra of the polluted, hydrogen-rich
white dwarf NLTT 25792. The spectra show strong lines of calcium (Ca H&K,
near-infrared calcium triplet, and Ca I 4226 and numerous lines of... | astro-ph_SR |
Evolution and chemical yields of AGB stars: effects of low-temperature
opacities: The studies focused on the Thermally-Pulsing Asymptotic Giant Branch phase
experienced by low- and intermediate-mass stars are extremely important in many
astrophysical contexts. In particular, a detailed computation of their chemical
y... | astro-ph_SR |
Pulsations, eruptions, and evolution of four yellow hypergiants: We aim to explore the variable photometric and stellar properties of four
yellow hypergiants (YHGs), HR8752, HR 5171A, $\rho$ Cas, and HD 179821, and
their pulsations of hundreds of days, and long-term variations (LTVs) of years.
We tackled multi-colour a... | astro-ph_SR |
The potential of combining MATISSE and ALMA observations: Constraining
the structure of the innermost region in protoplanetary discs: In order to study the initial conditions of planet formation, it is crucial
to obtain spatially resolved multi-wavelength observations of the innermost
region of protoplanetary discs. ... | astro-ph_SR |
Statistical Study of Coronal Mass Ejection Source Locations: II. Role of
Active Regions in CME Production: This is the second paper of the statistical study of coronal mass ejection
(CME) source locations, in which the relationship between CMEs and active
regions (ARs) is statistically studied on the basis of the inf... | astro-ph_SR |
A critical analysis of three near-infrared photometric methods of
estimating distances to cataclysmic variables: A critical analysis of three methods of estimating distances to cataclysmic
variables (CVs) is performed. These methods, by Ak et al., Beuermann, and
Knigge, all use near-infrared (JHK or Ks) magnitudes an... | astro-ph_SR |
The $UBV$ Color Evolution of Classical Novae. III. Time-Stretched
Color-Magnitude Diagram of Novae in Outburst: We propose a modified color-magnitude diagram for novae in outburst, i.e.,
$(B-V)_0$ versus $(M_V-2.5 \log f_{\rm s})$, where $f_{\rm s}$ is the
timescaling factor of a (target) nova against a comparison (t... | astro-ph_SR |
Fundamental Parameters of Main-Sequence Stars in an Instant with Machine
Learning: Owing to the remarkable photometric precision of space observatories like
Kepler, stellar and planetary systems beyond our own are now being
characterized en masse for the first time. These characterizations are pivotal
for endeavors s... | astro-ph_SR |
CoRoT-TESS eclipsing binaries with light-travel-time effect: Identifying long-period eclipsing binaries with space-based photometry is
still a challenge even in the century of space telescopes due to the relatively
short observation sequences and short lifetime of these missions. The
Transiting Exoplanet Survey Satelli... | astro-ph_SR |
Numerical Investigation of a Coronal Mass Ejection from an Anemone
Active Region: Reconnection and Deflection of the 2005 August 22 Eruption: We present a numerical investigation of the coronal evolution of a coronal
mass ejection (CME) on 2005 August 22 using a 3-D thermodynamics
magnetohydrodynamic model, the SWMF.... | astro-ph_SR |
Acceleration and propagation of Solar Energetic Particles: Solar Energetic Particles (SEPs) are an important component of Space Weather,
including radiation hazard to humans and electronic equipment, and the
ionisation of the Earth's atmosphere. We review the key observations of SEPs,
our current understanding of their... | astro-ph_SR |
Metric Radio Bursts and Fine Structures Observed on January 20, 2005: A major radio event, associated with an X7.1/2B flare in AR720 and a fast CME
was observed on January 20, 2005 with the radio-spectrograph ARTEMIS-IV; it was
particularly intense and with a complex radio signature with rich fine
structure which was r... | astro-ph_SR |
Lorentz Force Evolution Reveals the Energy Buildup Processes during
Recurrent Eruptive Solar Flares: The energy release and build-up processes in the solar corona have
significant implications in particular for the case of large recurrent flares,
which pose challenging questions about the conditions that lead to the ... | astro-ph_SR |
A New Transition Wolf-Rayet WN/C Star in the Milky Way: We report the discovery of a new transition type Wolf-Rayet (WR) WN/C star in
the Galaxy. According to its coordinates (R.A., Dec)J2000 = 18h51m39.7s,
-05d34m51.1s, and the distance (7.11 kpc away from Earth) inferred from the
second Gaia, data release, it's found... | astro-ph_SR |
The RR Lyrae Variable Population in the Phoenix Dwarf Galaxy: We present the first detailed study of the RR Lyrae variable population in
the Local Group dSph/dIrr transition galaxy, Phoenix, using previously obtained
HST/WFPC2 observations of the galaxy. We utilize template light curve fitting
routines to obtain best f... | astro-ph_SR |
Constraining general massive-star physics by exploring the unique
properties of magnetic O-stars: Rotation, macroturbulence, and sub-surface
convection: A quite remarkable aspect of non-interacting O-stars with detected surface
magnetic fields is that they all are very slow rotators. This paper uses this
unique pro... | astro-ph_SR |
Coadded Spectroscopic Stellar Parameters and Abundances from the LAMOST
Low Resolution Survey: I combine duplicate spectroscopic stellar parameter estimates in the Large
Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Data Release 6 Low
Resolution Spectral Survey A, F, G, and K Type stellar parameter cat... | astro-ph_SR |
Correlation of the sunspot number and the waiting time distribution of
solar flares, coronal mass ejections, and solar wind switchback events
observed with the Parker Solar Probe: Waiting time distributions of solar flares and {\sl coronal mass ejections
(CMEs)} exhibit power law-like distribution functions with sl... | astro-ph_SR |
Near Infrared studies of the carbon-monoxide and dust forming nova V5668
Sgr: We present near-infrared (NIR) observations of Nova V5668 Sgr, discovered in
outburst on 2015 March 15.634 UT, between 2d to 107d after outburst. NIR
spectral features are used to classify it as a FeII class of nova. The spectra
follow the ... | astro-ph_SR |
Investigating 2MASS J06593158-0405277: a FUor burst in a triple system?: FUor outbursts in young stellar objects (YSOs) are the most dramatic events
among episodic accretion phenomena. The origin of these bursts is not clear:
disk instabilities and/or disk perturbations by an external body being the most
viable hypothe... | astro-ph_SR |
Ultrashort-period MS eclipsing systems. New observations and light curve
solutions of six NSVS binaries: We carried out photometric and low-resolution spectral observations of six
eclipsing ultrashort-period binaries with MS components. The light curve
solutions of the Rozhen observations show that all targets are ov... | astro-ph_SR |
First Observation of Chromospheric Waves in a Sunspot by DKIST/ViSP: The
Anatomy of an Umbral Flash: The Visible Spectro-Polarimeter (ViSP) of the NSF Daniel K. Inouye Solar
Telescope (DKIST) collected its Science Verification data on May 7-8, 2021. The
instrument observed multiple layers of a sunspot atmosphere simu... | astro-ph_SR |
Validating Forward Modeling and Inversions of Helioseismic Holography
Measurements: Here we use synthetic data to explore the performance of forward models and
inverse methods for helioseismic holography. Specifically, this work presents
the first comprehensive test of inverse modeling for flows using
lateral-vantage... | astro-ph_SR |
New Parallaxes for the Upper Scorpius OB Association: Upper Scorpius is a subgroup of the nearest OB association,
Scorpius--Centaurus. Its young age makes it an important association to study
star and planet formation. We present parallaxes to 52 low mass stars in Upper
Scorpius, 28 of which have full kinematics. We me... | astro-ph_SR |
Distances of CVs and related objects derived from Gaia Data Release 1: We consider the parallaxes of sixteen cataclysmic variables and related
objects that are included in the TGAS catalogue, which is part of the Gaia
first data release, and compare these with previous parallax measurements. The
parallax of the dwarf n... | astro-ph_SR |
The Photometric Investigation of V921 Her using the Lunar-based
Ultraviolet Telescope of Chang'e-3 mission: The light curve of V921 Her in ultraviolet band observed by the Lunar-based
Ultraviolet Telescope (LUT) is analyzed by the Wilson-Devinney code. Our
solutions conclude that V921 Her is an early type marginal co... | astro-ph_SR |
The circumbinary rings of GG Carinae: indications of disc eccentricity
growth in the B[e] supergiant's atomic emission lines: B[e] supergiants have unusual circumstellar environments which may include
thin, concentric rings displaying atomic line emission. GG Carinae is a B[e]
supergiant binary which exhibits such a ... | astro-ph_SR |
ASAS Light Curves of Intermediate Mass Eclipsing Binaries and the
Parameters of HI Mon: We present a catalog of 56 candidate intermediate mass eclipsing binary
systems extracted from the 3rd data release of the All Sky Automated Survey. We
gather pertinent observational data and derive orbital properties, including
e... | astro-ph_SR |
Particle acceleration by circularly and elliptically polarised
dispersive Alfven waves in a transversely inhomogeneous plasma in the
inertial and kinetic regimes: Dispersive Alfven waves (DAWs) offer, an alternative to magnetic
reconnection, opportunity to accelerate solar flare particles. We study the
effect of DA... | astro-ph_SR |
A CCD Search for Variable Stars of Spectral Type B in the Northern
Hemisphere Open Clusters. VII. NGC 1502: We present results of variability search in the field of the young open
cluster NGC 1502. Eight variable stars were discovered. Of six other stars in
the observed field that were suspected for variability, we c... | astro-ph_SR |
Long-Term Measurements of Sunspot Magnetic Tilt Angles: Tilt angles of close to 30,600 sunspots are determined using Mount Wilson
daily averaged magnetograms taken from 1974 to 2012, and MDI/SoHO magnetograms
taken from 1996 to 2010. Within a cycle, more than 90% of sunspots have a
normal polarity alignment along the e... | astro-ph_SR |
Iron abundance in the prototype PG1159 star, GW Vir pulsator PG1159-035,
and related objects: We performed an iron abundance determination of the hot, hydrogen deficient
post-AGB star PG1159-035, which is the prototype of the PG1159 spectral class
and the GW Vir pulsators, and of two related objects (PG1520+525, PG11... | astro-ph_SR |
Torsional oscillations of nonbare strange stars: Strange stars are one of the possible compact stellar objects that can be
formed after a supernova collapse. We consider a model of strange star having
an inner core in the color-flavor locked phase surmounted by a crystalline
color superconducting layer. These two phase... | astro-ph_SR |
ASASSN-18di: discovery of a $ΔV \sim 10$ flare on a mid-M dwarf: We report and characterize a white-light superflare on a previously
undiscovered M dwarf detected by the ASAS-SN survey. Employing various
color-magnitude and color-spectral type relationships, we estimate several
stellar parameters, including the quiesce... | astro-ph_SR |
Vector Magnetic Fields and Current Helicities in Coronal Holes and Quiet
Regions: In the solar photosphere, many properties of coronal holes (CHs) are not
known, especially vector magnetic fields. Using observations from
\emph{Hinode}, we investigate vector magnetic fields, current densities and
current helicities in... | astro-ph_SR |
The First TESS Self-Lensing Pulses: Revisiting KIC 12254688: We report the observations of two self-lensing pulses from KIC 12254688 in
Transiting Exoplanet Survey Satellite (TESS) light curves. This system,
containing a F2V star and white-dwarf companion, was amongst the first
self-lensing binary systems discovered by... | astro-ph_SR |
From Predicting Solar Activity to Forecasting Space Weather: Practical
Examples of Research-to-Operations and Operations-to-Research: The successful transition of research to operations (R2O) and operations to
research (O2R) requires, above all, interaction between the two communities. We
explore the role that close ... | astro-ph_SR |
Solar Electron Beam -- Langmuir Wave Interactions and How They Modify
Solar Electron Beam Spectra: Solar Orbiter Observations of a Match Made in
the Heliosphere: Solar Orbiter's four in-situ instruments have recorded numerous energetic
electron events at heliocentric distances between 0.5 and 1au. We analyse
energe... | astro-ph_SR |
Wobbling jets in common envelope evolution: We find that the convective motion in the envelopes of red supergiant (RSG)
stars supplies a non-negligible stochastic angular momentum to the mass that a
secondary star accretes in a common envelope evolution (CEE), such that jets
that the secondary star launches wobble. The... | astro-ph_SR |
The Wolf-Rayet binaries of the nitrogen sequence in the Large Magellanic
Cloud: spectroscopy, orbital analysis, formation, and evolution: Massive Wolf-Rayet (WR) stars dominate the radiative and mechanical energy
budget of galaxies and probe a critical phase in the evolution of massive stars
prior to core-collapse. I... | astro-ph_SR |
First Results from the CHEPS: Exoplanets and the Discovery of an
Eccentric Brown Dwarf in the Desert: We report the discovery of a brown dwarf on an eccentric orbit and with a
semimajor axis that places it in the brown dwarf desert region around the star
HD191760. The star has a spectral type of G3IV/V and a metallic... | astro-ph_SR |
Surface convection: from the Sun to red giant stars: We check how the change in surface conditions between the Sun and red giant
branch stars changes the characteristic surface convection length scale to be
used in models. We investigate the question in the case of the mixing length
theory and of the phenomenology of f... | astro-ph_SR |
Tracing the ISM magnetic field morphology: The potential of
multi-wavelength polarization measurements: $\textit{Aims.}$ We present a case study to demonstrate the potential of
multi-wavelength polarization measurements. The aim is to investigate the
effects that dichroic polarization and thermal re-emission have on ... | astro-ph_SR |
Likely Members of the Beta Pictoris and AB Doradus Moving Groups in the
North: We present first results from follow-up of targets in the northern hemisphere
Beta Pictoris and AB Doradus moving group candidate list of Schlieder, Lepine,
and Simon (2012). We obtained high-resolution, near-infrared spectra of 27
candida... | astro-ph_SR |
Gravitoturbulent dynamo in global simulations of gaseous disks: The turbulence driven by gravitational instabilities (GIs) can amplify
magnetic fields in massive gaseous disks. This GI dynamo may appear in young
circumstellar disks, whose weak ionization challenges other amplification
routes, as well as in active galac... | astro-ph_SR |
The rotation of field stars from CoRoT data: We present period measurements of a large sample of field stars in the solar
neighbourhood, observed by CoRoT in two different directions of the Galaxy. The
presence of a period was detected using the Scargle Lomb Normalized Periodogram
technique and the autocorrelation anal... | astro-ph_SR |
Rapid Enhancement of Sheared Evershed Flow Along the Neutral Line
Associated with an X6.5 Flare Observed by Hinode: We present G-band and Ca II H observations of NOAA AR 10930 obtained by
Hinode/SOT on 2006 December 6 covering an X6.5 flare. Local Correlation
Tracking (LCT) technique was applied to the foreshortening... | astro-ph_SR |
High-frequency wave power observed in the solar chromosphere with IBIS
and ALMA: We present observational constraints on the solar chromospheric heating
contribution from acoustic waves with frequencies between 5 and 50 mHz. We
utilize observations from the Dunn Solar Telescope in New Mexico complemented
with observa... | astro-ph_SR |
The ISO Long Wavelength Spectrometer line spectrum of VY Canis Majoris
and other oxygen-rich evolved stars: The far-infrared spectra of circumstellar envelopes around various
oxygen-rich stars were observed using the ISO Long Wavelength Spectrometer
(LWS). We have examined high signal-to-noise ISO LWS observations of... | astro-ph_SR |
Inversion of physical parameters in solar atmospheric seismology: Magnetohydrodynamic (MHD) wave activity is ubiquitous in the solar
atmosphere. MHD seismology aims to determine difficult to measure physical
parameters in solar atmospheric magnetic and plasma structures by a combination
of observed and theoretical prop... | astro-ph_SR |
Formation pathway for lonely stripped-envelope supernova progenitors:
implications for Cassiopeia A: We explore a new scenario for producing stripped-envelope supernova
progenitors. In our scenario, the stripped-envelope supernova is the second
supernova of the binary, in which the envelope of the secondary was remov... | astro-ph_SR |
Grids of stellar models with rotation - I. Models from 0.8 to 120 Msun
at solar metallicity (Z = 0.014): [abridged] Many topical astrophysical research areas, such as the properties
of planet host stars, the nature of the progenitors of different types of
supernovae and gamma ray bursts, and the evolution of galaxies... | astro-ph_SR |
On the identification of time interval threshold in the twin-CME
scenario: Recently it has been suggested that the "twin-CME" scenario Li.etal2012 may
be a very effective mechanism in causing extreme Solar Energetic Particle (SEP)
events and in particular Ground Level Enhancement (GLE) events. Ding.etal2013
performed... | astro-ph_SR |
Radial velocity photon limits for the dwarf stars of spectral classes
F--M: The determination of extrasolar planet masses with the radial velocity (RV)
technique requires spectroscopic Doppler information from the planet's host
star, which varies with stellar brightness and temperature. We analyze Doppler
information... | astro-ph_SR |
On the accretion process in a high-mass star forming region - A
multitransitional THz Herschel-HIFI study of ammonia toward G34.26+0.15: [Abridged] Our aim is to explore the gas dynamics and the accretion process
in the early phase of high-mass star formation. The inward motion of molecular
gas in the massive star fo... | astro-ph_SR |
The Shapes of AGB Envelopes as Probes of Binary Companions: We describe how the large scale geometry of the circumstellar envelopes of
asymptotic giant branch stars can be used to probe the presence of unseen
stellar companions. A nearby companion modifies the mass loss by
gravitationally focusing the wind towards the ... | astro-ph_SR |
A Survey for H-alpha Emission from Late L dwarfs and T dwarfs: Recently, studies of brown dwarfs have demonstrated that they possess strong
magnetic fields and have the potential to produce radio and optical auroral
emissions powered by magnetospheric currents. This emission provides the only
window on magnetic fields ... | astro-ph_SR |
Differential rotation in main-sequence solar-like stars: Qualitative
inference from asteroseismic data: Understanding differential rotation of Sun-like stars is of great importance
for insight into the angular momentum transport in these stars. One means of
gaining such information is that of asteroseismology. By a f... | astro-ph_SR |
Reconstruction of a Large-scale Pre-flare Coronal Current Sheet
Associated with an Homologous X-shaped Flare: As a fundamental magnetic structure in the solar corona, electric current
sheets (CSs) can form either prior to or during solar flare, and they are
essential for magnetic energy dissipation in the solar coron... | astro-ph_SR |
Masses of the Hyades white dwarfs: A gravitational redshift measurement: Context. It is possible to accurately measure the masses of the white dwarfs
(WDs) in the Hyades cluster using gravitational redshift, because the radial
velocity of the stars can be obtained independently of spectroscopy from
astrometry and the c... | astro-ph_SR |
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