Oxygen, α-element and iron abundance distributions in the inner part of the Galactic thin disc

Abstract

We derived elemental abundances in 27 Cepheids, the great majority situated within a zone of Galactocentric distances ranging from 5 to 7 kpc. One star of our sample, SU Sct, has a Galactocentric distance of about 3 kpc, and thus falls in a poorly investigated region of the inner thin disc. Our new results, combined with data on abundances in the very central part of our Galaxy taken from literature, show that iron, magnesium, silicon, sulfur, calcium and titanium LTE abundance radial distributions, as well as NLTE distribution of oxygen reveal a plateau-like structure or even positive abundance gradient in the region extending from the Galactic center to about 5 kpc.

References in corpus (6)

• A new calibration of Galactic Cepheid Period-Luminosity relations from B to K bands, and a comparison to LMC PL relations
• On the fine structure of the Cepheid metallicity gradient in the Galactic thin disk
• Chemical Abundances of Luminous Cool Stars in the Galactic Center from High-Resolution Infrared Spectroscopy
• Oxygen abundance distribution in Galactic disc
• Chemical Abundances of M giants in the Galactic Center: a Single Metal-Rich Population with Low [alpha/Fe]
• The role of massive stars in galactic chemical evolution

Cited by in corpus (12)

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• Oxygen, $\alpha$-element and iron abundance distributions in the inner part of the Galactic thin disc. II
• Analysing the spectral energy distributions of Galactic classical Cepheids
• CNO abundances and carbon isotope ratios in evolved stars of the open clusters NGC 2324, NGC 2477, and NGC 3960
• Breaks in surface brightness profiles and radial abundance gradients in the discs of spiral galaxies
• 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
• The flux-weighted gravity-luminosity relation of Galactic classical Cepheids
• The MAGIC project. III. Radial and azimuthal Galactic abundance gradients using classical Cepheids
• On the metallicity gradients of the Galactic disk as revealed by LSS-GAC red clump stars