Abundance trend with condensation temperature for stars with different Galactic birth places
| Autor: | L. Suarez-Andres, S. G. Sousa, Nuno C. Santos, Ivan Minchev, João P. Faria, V. Adibekyan, A. A. Hakobyan, E. Delgado-Mena, G. Harutyunyan, Pedro Figueira, Garik Israelian, J. I. González Hernández |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
010308 nuclear & particles physics FOS: Physical sciences Astronomy and Astrophysics Context (language use) Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Spectral line Condensation temperature Stars Astrophysics - Solar and Stellar Astrophysics 13. Climate action Space and Planetary Science Abundance (ecology) 0103 physical sciences Galaxy formation and evolution Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Disc 10. No inequality 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Solar and Stellar Astrophysics (astro-ph.SR) |
| Zdroj: | NASA Astrophysics Data System |
| DOI: | 10.48550/arxiv.1606.04714 |
| Popis: | During the past decade, several studies reported a correlation between chemical abundances of stars and condensation temperature (also known as Tc trend). However, the real astrophysical nature of this correlation is still debated. The main goal of this work is to explore the possible dependence of the Tc trend on stellar Galactocentric distances, Rmean. We used high-quality spectra of about 40 stars observed with the HARPS and UVES spectrographs to derive precise stellar parameters, chemical abundances, and stellar ages. A differential line-by-line analysis was applied to achieve the highest possible precision in the chemical abundances. We confirm previous results that [X/Fe] abundance ratios depend on stellar age and that for a given age, some elements also show a dependence on Rmean. When using the whole sample of stars, we observe a weak hint that the Tc trend depends on Rmean. The observed dependence is very complex and disappears when only stars with similar ages are considered. To conclude on the possible dependence of the Tc trend on the formation place of stars, a larger sample of stars with very similar atmospheric parameters and stellar ages observed at different Galactocentric distances is needed Comment: Accepted by A&A |
| Databáze: | OpenAIRE |
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