Revised Magnesium Abundances in Galactic Halo and Disk Stars

Details Revised Magnesium Abundances in Galactic Halo and Disk Stars Revised Magnesium Abundances in Galactic Halo and Disk Stars

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001arep...45..100s&link_type=abstract

Astronomy Reports, Volume 45, Issue 2, February 2001, pp.100-112

Astronomy and Astrophysics

Astronomy

3

Scientific paper

A differential analysis of the magnesium abundances in 61 F-K dwarfs and subgiants with metallicities -2.6<[Fe/H]<+0.2 is performed based on published observational data. Fundamental parameters for 36 stars are determined: T eff from V-K and V-R; logg from HIPPARCOS parallaxes, and [Fe/H] and ξt from Fe II lines. The computations allow for non-LTE effects in the formation of the Mg I lines. For most of the stars, the standard errors in the Mg abundances do not exceed 0.07 dex. The metallicity dependence of [Mg/Fe] is analyzed. Magnesium shows a constant overabundance relative to Fe of 0.46±0.06 dex for metallicities -2.6<[Fe/H]<-0.7 Mg. The Mg overabundance decreases abruptly to ˜+0.27 dex at [Fe/H]⋍-0.7. At higher metallicities, the Mg abundance smoothly decreases to the solar value at [Fe/H]=0.0. Halo stars with metallicities [Fe/H]<-1.0 exhibit lower Mg overabundances ( ) compared to the [Mg/Fe] values for other stars with similar [Fe/H].

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