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We analyse the stellar and hot gas content of 18 nearby, low-mass galaxy clusters, detected in
redshift space and selected to have a dynamical mass 3 × 1014 < M/M⊙ < 6 × 1014 (h =0.7), as measured fr...
Abundance anomalies in pre-main-sequence stars: Stellar evolution models with mass loss
Diffusion — stars chemically peculiar — stars mass–loss — stars pre–main-sequence — stars evolution — stars
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2010/11/12
Aims. The effects of atomic diffusion on internal and surface abundances of A and F pre–main-sequence stars with mass loss are studied in order to determine at what age the effects materialize, as wel...
The stellar evolution of Luminous Red Galaxies, and its dependence on colour, redshift, luminosity and modelling
galaxies evolution - cosmology observations - surveys
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2010/11/15
We present a series of colour evolution models for Luminous Red Galaxies (LRGs) in the 7th spectroscopic data release of the Sloan Digital Sky Survey (SDSS), computed using the full-spectrum fitting c...
The interactions of winds from massive young stellar objects
interactions of winds massive young stellar objects
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2010/11/10
The supersonic stellar and disk winds possessed by massive young stellar objects will produce
shocks when they collide against the interior of a pre-existing bipolar cavity (resulting from an earlier...
Dynamical versus Stellar Masses of Ultracompact Dwarf Galaxies in the Fornax Cluster
galaxies dwarf – galaxies elliptical and lenticular cD – galaxies evo-lution – galaxies stellar content – galaxies kinematics and dynamics
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2010/11/12
The origin of ultracompact dwarf (UCD) galaxies, compact extragalactic stellar sys-tems, is still a puzzle for present galaxy formation models. We present the compre-hensive analysis of high resolutio...
The WFC3 Galactic Bulge Treasury Program: Metallicity Estimates for the Stellar Population and Exoplanet Hosts
Galaxy bulge — Galaxy formation — Galaxy stellar content — stars
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2010/11/10
We present new UV-to-IR stellar photometry of four low-extinction windows in the Galactic bulge, obtained with the Wide Field Camera 3 on the Hubble Space Telescope (HST). Using our five bandpasses, w...
Global-scale wreath-building dynamos in stellar convection zones
convection interiors magnetic fields stars rotation
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2010/11/10
When stars like our Sun are young they rotate rapidly and are very magnetically active. We explore dynamo action in rapidly rotating suns with the 3-D MHD anelastic spherical harmonic (ASH) code. The ...
A Review of Type Ia Supernovae as Stellar Endpoints and Cosmological Tools
Review of Type Ia Supernovae Stellar Endpoints Cosmological Toolsas Stellar Endpoints Cosmological Tools
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2010/11/10
Empirically, Type Ia supernovae are the most useful, precise, and mature tools for determining
astronomical distances. Acting as calibrated candles they revealed the presence of dark energy and are b...
Flux-calibrated stellar population models of Lick absorption-line indices with variable element abundance ratios
Flux-calibrated stellar population models Lick absorption-line indices
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2011/1/10
We present new stellar population models of Lick absorption-line indices with variable element abundance ratios. The models are based on our new calibrations of absorption-line indices with stellar pa...
Galaxy stellar mass functions of different morphological types in clusters, and their evolution between z=0.8 and z=0
Galaxy stellar mass functions morphological types
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2011/1/10
We present the galaxy stellar mass function (MF) and its evolution in clusters from z~0.8 to the current epoch, based on the WIde-field Nearby Galaxy-cluster Survey (WINGS) (0.04
Classification of field dwarfs and giants in RAVE and its use in stellar stream detection
Galaxy Astrophysics (astro-ph.GA)
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2011/1/7
An efficient separation between dwarfs and giants in surveys of bright stars is important, especially for studies in which distances are estimated through photometric parallax relations.
The evolution of massive binaries in a dense stellar cluster environment
Solar and Stellar Astrophysics (astro-ph.SR)
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2011/1/5
Massive stars are among the most important objects in the Universe and many (most?) of them are formed in binaries. A selection of observational and theoretical facts that illustrate the importance of...
Review about populations of Be stars: stellar evolution of extreme stars
Solar and Stellar Astrophysics (astro-ph.SR)
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2011/1/6
Among the emission-line stars, the classical Be stars known for their extreme properties are remarkable. The Be stars are B-type main sequence stars that have displayed at least once in their life emi...
Investigating accretion disk - radio jet coupling across the stellar mass scale
High Energy Astrophysical Phenomena (astro-ph.HE)
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2011/1/5
Relationships between the X-ray and radio behavior of black hole X-ray binaries during outbursts have established a fundamental coupling between the accretion disks and radio jets in these systems.
Modeling the ionizing spectra of H ii regions: individual stars versus stellar ensembles
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
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2011/1/5
We study how IMF sampling affects the ionizing flux and emission line spectra of low mass stellar clusters.