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Chemical composition of stars in the galactic halo
Ermakov, SV; Klochkova, VG; Panchuk, VE; Zhao, G
AbstractThe 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, alpha-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, [alpha/Fe] approximate to -0.3, [Na/Fe] = -0.60, [Sc/Fe] = -0.57, [Cr, Ni, Fe] approximate to 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. (C) 2002 MAIK "Nauka/Interperiodica".
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WOS IDWOS:000179506900003
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Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Russian Acad Sci, Special Astrophys Observ, Cherkessiya Republ 357147, Russia
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
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GB/T 7714
Ermakov, SV,Klochkova, VG,Panchuk, VE,et al. Chemical composition of stars in the galactic halo[J]. ASTRONOMY REPORTS,2002,46(11):874-886.
APA Ermakov, SV,Klochkova, VG,Panchuk, VE,&Zhao, G.(2002).Chemical composition of stars in the galactic halo.ASTRONOMY REPORTS,46(11),874-886.
MLA Ermakov, SV,et al."Chemical composition of stars in the galactic halo".ASTRONOMY REPORTS 46.11(2002):874-886.
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