The Lick/SDSS Library. II. [Ca/Fe] and [Mg/Fe] in F, G, and K Stars from SDSS-DR7

Details The Lick/SDSS Library. II. [Ca/Fe] and [Mg/Fe] in F, G, and K Stars from SDSS-DR7 The Lick/SDSS Library. II. [Ca/Fe] and [Mg/Fe] in F, G, and K Stars from SDSS-DR7

Apr 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...730..117f&link_type=abstract

The Astrophysical Journal, Volume 730, Issue 2, article id. 117 (2011).

Astronomy and Astrophysics

Astronomy

Galaxy: Stellar Content, Stars: Abundances, Stars: Fundamental Parameters, Stars: Late-Type

Scientific paper

We analyzed the spectra of 17,600 F, G, and K stars extracted from the seventh Sloan Digital Sky Survey Data Release (SDSS-DR7) database in order to derive lang[α/Fe]rang, [Ca/Fe], and [Mg/Fe] ratios. Particular attention has been devoted to estimating homogeneous and self-consistent atmospheric parameter values, T eff, log g, and [Fe/H], by comparing synthetic and observational Lick/SDSS indices. We present results for the sub-sample of more than 4000 spectra whose overall quality allowed us to derive fairly accurate stellar atmospheric parameter values and, therefore, reliable abundance ratios. A Monte Carlo approach was adopted to evaluate both the errors in the observational Lick/SDSS indices and in the derived parameter estimates. The analysis of the trends of [Ca/Fe] and [Mg/Fe] versus [Fe/H] pointed out that (1) the [Ca/Fe] and [Mg/Fe] ratios increase with decreasing [Fe/H] with different slopes reaching maximum average levels of +0.25 and +0.40 dex at [Fe/H] ~= -1.75, respectively; (2) our sample contains, at a given [Fe/H], stars characterized by significantly different amounts of α-enhancement, thus belonging to different Galactic populations; and (3) the analyzed sample shows a predominance of thick disk stars for [Fe/H] > - 0.5 and the presence of stars belonging to the "high-α" halo population for -2.0 < [Fe/H] <-0.5.

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