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.

5 pages, 3 figures

References in corpus (3)

• Oxygen abundance distribution in Galactic disc
• Oxygen, α-element and iron abundance distributions in the inner part of the Galactic thin disc
• The role of massive stars in galactic chemical evolution

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• Metallicity estimation of MW, SMC and LMC classical Cepheids from the shape of the $V$- and $I$-band light curves
• Young and Intermediate-age Distance Indicators
• Atmospheric parameters of Cepheids from flux ratios with ATHOS: I. The temperature scale
• Nitrogen Abundance Distribution in the inner Milky Way
• The flux-weighted gravity-luminosity relation of Galactic classical Cepheids