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J/AJ/140/1911 Astrometric Grid Giant Star Survey. II. (Bizyaev+, 2010)
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Beginning of ReadMe :J/AJ/140/1911 Astrometric Grid Giant Star Survey. III. (Bizyaev+, 2010)
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The Space Interferometry Mission Astrometric Grid Giant Star Survey.
III. Basic stellar parameters for an extended sample.
Bizyaev D., Smith V.V., Cunha K.
<Astron. J., 140, 1911-1918 (2010)>
=2010AJ....140.1911B
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ADC_Keywords: Stars, late-type ; Spectroscopy ; Radial velocities;
Abundances, [Fe/H]
Keywords: stars: abundances - stars: atmospheres -
stars: fundamental parameters - stars: late-type - stars: rotation
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 Teff, logg, [Fe/H], microturbulence velocity, and
projected rotational velocities, vsin i, 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] -0.3dex).
An analysis of Mg abundances in the sample results in consistency of
the [Mg/Fe] vs [Fe/H] trend with published results.
Description:
Observations were conducted using the 2.1m telescope at the McDonald
Observatory and the Sandiford Cassegrain echelle spectrograph, which
provides a nominal resolution R=55000.