Oxygen, $\alpha$-element and iron abundance distributions in the inner part of the Galactic thin disc. II

Abstract

We have derived the abundances of 36 chemical elements in one Cepheid star, ASAS 181024--2049.6, located R${}_{\mathrm{G}}=2.53$ 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.

arXiv comment5 pages, 3 figures

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