Oxygen, $\alpha$-element and iron abundance distributions in the inner part of the Galactic thin disc. II
| Autor: | Andrievsky, S. M., Martin, R. P., Kovtyukh, V. V., Korotin, S. A., Lépine, J. R. D. |
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| Rok vydání: | 2016 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnras/stw1631 |
| Popis: | We have derived the abundances of 36 chemical elements in one Cepheid star, ASAS 181024--2049.6, located R$_{\rm G}= 2.53$ kpc from the Galactic center. This star falls within a region of the inner thin disc poorly sampled in Cepheids. Our spectral analysis shows that iron, magnesium, silicon, calcium and titanium LTE abundances in that star support the presence of a plateau-like abundance distribution in the thin disc within 5 kpc of the Galactic center, as previously suggested by \cite{Maret15}. If confirmed, the flattening of the abundance gradient within that region could be the result of a decrease in the star formation rate due to dynamic effects, possibly from the central Galactic bar. Comment: 5 pages, 3 figures |
| Databáze: | arXiv |
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