Chemical abundances in 10 red horizontal branch stars located in the galactic field

Details Chemical abundances in 10 red horizontal branch stars located in the galactic field Chemical abundances in 10 red horizontal branch stars located in the galactic field

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.286..948t&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 286, Issue 4, pp. 948-956.

Astronomy and Astrophysics

Astronomy

4

Stars: Abundances, Stars: Atmospheres, Stars: Horizontal Branch

Scientific paper

High-dispersion spectra of 10 red horizontal branch (RHB) stars of the galactic field were obtained on the 6-m Special Astrophysical Observatory (SAO) telescope to investigate abundances of up to 22 chemical elements. This constitutes the largest single high-resolution abundance study of RHB stars located in the galactic field. Abundance trends in the range of -1.9<=[Fe/H]<=-0.2 are compared with results for dwarfs and red giants, as well as with theoretical trends. For five metal-deficient stars of the sample, a slight overabundance of oxygen is revealed. The results for alpha-process elements match theoretical predictions; only [Mg/Fe], for almost all stars, is below the theoretical trend. Almost all stars of the sample closely follow the solar [Na/Fe] ratio; only for the two most metal-abundant stars is sodium overabundant by 0.2-0.3dex. A comparison of the available abundances of atmospheres for the RHB stars with those for giants and dwarfs shows a good fit for the iron group elements and for other heavier elements; thus, RHB stars may also serve for Galactic chemical evolution studies.

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