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The Stellar Abundances for Galactic Archaeology (SAGA) Database II - Implications for Mixing and Nucleosynthesis in Extremely Metal-Poor Stars and Chemical Enrichment of the Galaxy
The Stellar Abundances for Galactic Archaeology Database II
2011/1/13
We discuss the characteristics of known extremely metal-poor (EMP) stars in the Galaxy using the Stellar Abundances for Galactic Archaeology (SAGA) database (Suda et al. 2008, PASJ, 60, 1159).The anal...
Detectability of Orbital Motion in Stellar Binary and Planetary Microlenses
Orbital Motion Stellar Binary Planetary Microlenses
2011/1/13
A standard binary microlensing event lightcurve allows just two parameters of the lensing system to be measured: the mass ratio of the companion to its host, and the projected separation of the compon...
Gravitational stability and dynamical overheating of stellar disks of galaxies
Gravitational stability dynamical overheating stellar disks of galaxies
2011/1/11
We use the marginal stability condition for galactic disks and the stellar velocity dispersion data published by different authors to place upper limits on the disk local surface density at two radial...
High Resolution HDS/SUBARU chemical abundances of the young stellar cluster Palomar 1
abundances Galaxy abundances globular clusters individual
2010/11/9
Context. Palomar 1 is a peculiar globular cluster (GC). It is the youngest Galactic GC and it has been tentatively associated to several of the substructures recently discovered in the Milky Way (MW),...
Studies of Stellar Collapse and Black Hole Formation with the Open-Source Code GR1D
stellar collapse neutron stars black holes supernovae
2010/11/9
We discuss results from simulations of black hole formation in failing core-collapse
supernovae performed with the code GR1D, a new open-source Eulerian spherically-symmetric
general-relativistic hy...
The WFC3 Galactic Bulge Treasury Program: Metallicity Estimates for the Stellar Population and Exoplanet Hosts
Galaxy bulge — Galaxy formation — Galaxy stellar content — stars
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...
Flux-calibrated stellar population models of Lick absorption-line indices with variable element abundance ratios
Flux-calibrated stellar population models Lick absorption-line indices
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
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
Review about populations of Be stars: stellar evolution of extreme stars
Solar and Stellar Astrophysics (astro-ph.SR)
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...
Modeling the ionizing spectra of H ii regions: individual stars versus stellar ensembles
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2011/1/5
We study how IMF sampling affects the ionizing flux and emission line spectra of low mass stellar clusters.
GLIMPSE-CO1: the most massive intermediate-age stellar cluster in the Galaxy
Galaxy Astrophysics (astro-ph.GA)
2011/1/5
The stellar cluster GLIMPSE-C01 is a dense stellar system located in the Galactic Plane. Though often referred to in the literature as an old globular cluster traversing the Galactic disk, previous ob...
The SEGUE Stellar Parameter Pipeline. V. Estimation of Alpha-Element Abundance Ratios From Low-Resolution SDSS/SEGUE Stellar Spectra
Instrumentation and Methods for Astrophysics (astro-ph.IM)
2011/1/5
We present a method for the determination of [alpha/Fe] ratios from low-resolution (R = 2000) SDSS/SEGUE stellar spectra.
Chemical abundances in metal-poor giants: limitations imposed by the use of classical 1D stellar atmosphere models
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/29
In this work we have used 3D hydrodynamical (CO5BOLD) and 1D hydrostatic (LHD) stellar atmosphere models to study the importance of convection and horizontal temperature inhomogeneities in stellar abu...
A multi-wavelength census of stellar contents in the young cluster NGC 1624
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/28
We present a comprehensive multi-wavelength analysis of the young cluster NGC 1624 associated with the H II region Sh2-212 using optical UBVRI photometry, optical spectroscopy and GMRT radio continuum...
The Hanle Effect as a Diagnostic of Magnetic Fields in Stellar Envelopes. V. Thin Lines from Keplerian Disks
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/28
This paper focuses on the polarized profiles of resonance scattering lines that form in magnetized disks. Optically thin lines from Keplerian planar disks are considered. Model line profiles are calcu...