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Galactic Globular and Open Clusters in the Sloan Digital Sky Survey. I. Crowded Field Photometry and Cluster Fiducial Sequences in ugriz
Deokkeun An, Jennifer A. Johnson, James L. Clem +22
We present photometry for globular and open cluster stars observed with the Sloan Digital Sky Survey (SDSS). In order to exploit over 100 million stellar objects with r < 22.5 mag…
The SEGUE Stellar Parameter Pipeline. II. Validation with Galactic Globular and Open Clusters
Y. S. Lee, T. C. Beers, T. Sivarani +13
We validate the performance and accuracy of the current SEGUE (Sloan Extension for Galactic Understanding and Exploration) Stellar Parameter Pipeline (SSPP), which determines stell…
The SEGUE Stellar Parameter Pipeline. I. Description and Initial Validation Tests
Y. S. Lee, T. C. Beers, T. Sivarani +10
We describe the development and implementation of the SEGUE (Sloan Extension for Galactic Exploration and Understanding) Stellar Parameter Pipeline (SSPP). The SSPP derives, using…
The Lowest Mass White Dwarf
Mukremin Kilic, Carlos Allende Prieto, Warren R. Brown +1
Extremely low mass white dwarfs are very rare objects likely formed in compact binary systems. We present MMT optical spectroscopy of 42 low mass white dwarf candidates serendipito…
SDSSJ103913.70+533029.7: A Super Star Cluster in the Outskirts of a Galaxy Merger
G. R. Knapp, C. A. Tremonti, C. M. Rockosi
We describe the serendipitous discovery in the spectroscopic data of the Sloan Digital Sky Survey of a star-like object, SDSSJ103913.70+533029.7, at a heliocentric radial velocity…
A Spectroscopic Study of the Ancient Milky Way: F- and G-Type Stars in the Third Data Release of the Sloan Digital Sky Survey
C. Allende Prieto, T. C. Beers, R. Wilhelm +4
(Abridged) We perform an analysis of spectra and photometry for 22,770 stars included in the third data release (DR3) of the SDSS. We measure radial velocities and, based on a mode…
A Study of the Near-Ultraviolet Spectrum of Vega
Alejandro García-Gil, Ramón J. García López, Carlos Allende Prieto +1
UV, optical, and near-IR spectra of Vega have been combined to test our understanding of stellar atmospheric opacities, and to examine the possibility of constraining chemical abun…
High-Resolution Spectroscopy of the Transiting Planet Host Star TrES-1
A. Sozzetti, D. Yong, G. Torres +6
We report on a spectroscopic determination of the stellar parameters and chemical abundances for the parent star of the transiting planet TrES-1. Based on a detailed analysis of ir…
Magnesium isotope ratios in Hyades stars
David Yong, David L. Lambert, Carlos Allende Prieto +1
Using classical model atmospheres and an LTE analysis, Mg isotope ratios 24Mg:25Mg:26Mg are measured in 32 Hyades dwarfs covering 4000K < Teff < 5000K. We find no significant trend…
Non-LTE Model Atmospheres for Late-Type Stars II. Restricted NLTE Calculations for a Solar-Like Atmosphere
C. Allende Prieto, I. Hubeny, D. L. Lambert
We test our knowledge of the atomic opacity in the solar UV spectrum. Using the atomic data compiled in Paper I from modern, publicly available, databases, we perform calculations…
Non-LTE Model Atmospheres for Late-Type Stars I. A Collection of Atomic Data for Light Neutral and Singly-Ionized Atoms
C. Allende Prieto, D. L. Lambert, I. Hubeny +1
With the goal of producing a reliable set of model atoms and singly-ionized ions for use in building NLTE model atmospheres, we have combined measured energy levels, critically-com…
A Reappraisal of the Solar Photospheric C/O Ratio
Carlos Allende Prieto, David L. Lambert, Martin Asplund
Accurate determination of photospheric solar abundances requires detailed modeling of the solar granulation and accounting for departures from local thermodynamical equilibrium (LT…
Convective Wavelength Shifts in the Spectra of Late-Type Stars
Carlos Allende Prieto, David L. Lambert, Robert G. Tull +1
We present ultra-high resolution spectra for a set of nearby F-G-K stars on, or close to, the main sequence. The wavelength shifts of stellar lines relative to their laboratory wav…
Spectroscopic Signatures of Convection in the Spectrum of Procyon. Fundamental Parameters and Iron Abundance
Carlos Allende Prieto, Martin Asplund, Ramon J. Garcia Lopez +1
We have observed the spectrum of Procyon A (F5IV) from 4559 to 5780 A with a S/N of ~ 1e3 and a resolving power of 2e5. We have measured the line bisectors and relative line shifts…
The INT Search for Metal-Poor Stars. Spectroscopic Observations and Classification via Artificial Neural Networks
C. Allende Prieto, R. Rebolo, R. J. Garcia Lopez +5
With the dual aims of enlarging the list of extremely metal-poor stars identified in the Galaxy, and boosting the numbers of moderately metal-deficient stars in directions that sam…
The Near-Ultraviolet Continuum of Late-Type Stars
Carlos Allende Prieto, David L. Lambert
Analyses of the near-ultraviolet continuum of late-type stars have led to controversial results regarding the performance of state-of-the-art model atmospheres. The release of the…
Model Photospheres for Late-Type Stars from the Inversion of High-Resolution Spectroscopic Observations. Groombridge 1830 and Epsilon Eridani
Carlos Allende Prieto, Ramon J. Garcia Lopez, David L. Lambert +1
An inversion technique to recover LTE one-dimensional model photospheres for late-type stars, which was previously applied to the Sun (Allende Prieto et al. 1998), is now employed…
A Consistency Test of Spectroscopic Gravities for Late-Type Stars
Carlos Allende Prieto, Ramon J. Garcia Lopez, David L. Lambert +1
Chemical analyses of late-type stars are usually carried out following the classical recipe: LTE line formation and homogeneous, plane-parallel, flux-constant, and LTE model atmosp…