Chemical composition of high proper-motion stars based on short-wavelength optical spectra |
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| Authors: | V G Klochkova T V Mishenina V E Panchuk S A Korotin V A Marsakov I A Usenko V V Tsymbal |
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| Institution: | 1.Special Astrophysical Observatory,Russian Academy of Sciences,Nizhnij Arkhyz,Russia;2.Astronomical Observatory,Odessa National University,Odessa,Ukraine;3.Southern Federal University,Rostov-on-Don,Russia;4.Taurian National University,Simferopol, Crimea,Ukraine |
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| Abstract: | The results of spectroscopic observations made with the NES echelle spectrograph of the 6-m BTA telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences in the wavelength interval of 3550–5100 Å with a spectral resolution of R≥50000 are used to determine the fundamental parameters and atmospheric abundances of more than 20 chemical elements including heavy s- and r-process elements from Sr to Dy for a total of 14 metal-poor G-K-type stars. The abundances of Mg, Al, Sr, and Ba were calculated with non-LTE line-formation effects accounted for. The inferred overabundance of europium with respect to iron agrees with the results obtained for the stars of similar metallicity. The chemical composition of the star BD+80°245 located far from the Galactic plane is typical of stars of the accreted halo: this star exhibits, in addition to the over-deficiency of α-process elements, also the over-deficiency of the γ-process element Ba: Ba/Fe]= ?1.46. The kinematical parameters and chemical composition imply that the stars studied belong to different Galactic populations. The abundance of the long-living element Th relative to that of the r-process element Eu is determined for six stars using the synthetic-spectrum method. |
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