Evolution of the titanium and oxygen abundances from observations of FGK dwarfs in a wide metallicity range |
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| Authors: | T M Sitnova |
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| Institution: | 1.Moscow State University,Moscow,Russia;2.Institute of Astronomy,Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | For a sample of dwarf stars close to the Sun with well-known atmospheric parameters and an iron abundance in the range ?2.6 < Fe/H] < 0.2, we have determined the titanium and oxygen abundances by taking into account the departures from LTE. The dependence of the O/Fe] and Ti/Fe] abundance ratios on Fe/H] has been refined in comparison with the published data. We have established that O/Fe] increases from ?0.2 to 0.6 as the metallicity Fe/H] decreases from 0.2 to ?0.8 and remains constant at a lower metallicity. A similar behavior has been found for Ti/Fe], but the plateau is formed by stars with Fe/H] > ?0.7, and the titanium overabundance relative to iron is 0.3. The results confirm that not only oxygen but also titanium are synthesized in the α-process. Our data can be used to test the Galactic chemical evolution models. |
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