Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002arep...46..874e&link_type=abstract
Astronomy Reports, Volume 46, Issue 11, pp.874-886
Astronomy and Astrophysics
Astronomy
2
Scientific paper
The chemical compositions of the atmospheres of six metal-poor stars are analyzed. Spectra with signal-to-noise ratios of no less than 100 and a resolution of R≈17 000 were obtained using the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences. The abundances of Li, O, α-process elements (Mg, Si, Ca, Ti), Na, K, Sc, iron-peak elements (Cr, Mn, Fe, Ni, Cu, Zn), and s-process elements (Y, Ba) are derived. The star G251-54 ([Fe/H]=-1.55, T eff=5541 K, log g=3.58) is deficient in some elements compared to both stars with similar metallicities and the Sun. The atmosphere of G251-54 has the following elemental abundances relative to iron: [O/Fe]=+0.47, [α/Fe]≈-0.3, [Na/Fe]=-0.60, [Sc/Fe]=-0.57, [Cr, Ni, Fe]≈0, [Zn/Fe]=+0.16, [Cu/Fe]=-0.66, [Y/Fe]=-0.70, and [Ba/Fe]=-1.35. The remaining five stars have metallicities in the range -1.6<[Fe/H]<-1.3 and normal abundances for this metallicity interval and are used as reference stars for comparison with the chemical composition of G251-54. Possible explanations for deviations of the abundances of some elements from the mean relations established for halo objects are discussed.
Ermakov S. V.
Klochkova Valentina G.
Panchuk Vladimir E.
Zhao Gang
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