The Space Interferometry Mission Astrometric Grid Giant-Star Survey. III. Basic Stellar Parameters for an Extended Sample

Abstract

We present results of high resolution (~ 55000) spectral observations of 830 photometrically pre-selected candidate red giants in the magnitude range of V = 9-12. We develop a pipeline for automated determination of the stellar atmospheric parameters from these spectra and estimate T_eff, logg, [Fe/H], microturbulence velocity, and projected rotational velocities, vsini, for the stars. The analysis confirms that the candidate selection procedure yielded red giants with very high success rate. We show that most of these stars are G and K giants with slightly subsolar metallicity ([Fe/H] ~ -0.3 dex) An analysis of Mg abundances in the sample results in consistency of the [Mg/Fe] vs [Fe/H] trend with published results.

Accepted by AJ

References in corpus (5)

• The SEGUE Stellar Parameter Pipeline. I. Description and Initial Validation Tests
• The SEGUE Stellar Parameter Pipeline. II. Validation with Galactic Globular and Open Clusters
• The SEGUE Stellar Parameter Pipeline. III. Comparison with High-Resolution Spectroscopy of SDSS/SEGUE Field Stars
• Vertical distribution of Galactic disk stars IV - AMR and AVR from clump giants
• Elemental abundances in the atmosphere of clump giants

Cited by in corpus (4)

• The Frequency of Rapid Rotation Among K Giant Stars
• The Penn State-Torun Centre for Astronomy Planet Search stars. I. Spectroscopic analysis of 348 red giants
• The Active Chromospheres of Lithium-Rich Red Giant Stars
• Atmospheric parameters and kinematic information for the M giants stars from LAMOST DR9