Published on Mon Sep 13 2021

Sulfur abundances in the Galactic bulge and disk

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Context. The measurement of -elements abundances provides a powerful tool to put constraints on chemical evolution and star formation history of galaxies. The majority of studies on the -element Sulfur (S) are focused on local stars, making S behavior in other environments an astronomical topic yet to be analyzed. Aims. The investigation of S in the Galactic bulge has only recently been considered for the first time. This work aims to improve our knowledge on S behavior in this component of the Milky Way. Methods. We present S abundances of 74 dwarf and sub-giant stars in the Galactic bulge, 21 and 30 F and G thick and thin disk stars. We performed local thermodynamic equilibrium analysis and applied corrections for non-LTE on high resolution and high signal-to-noise UVES spectra. S abundances were derived from multiplets 1, 6 and 8 in the metallicity range Fe/H0.6, by spectrosynthesis or line equivalent widths. Results. We confirm that S behaves like an -element within the Galactic bulge. In the S/Fe versus Fe/H diagram, S presents a plateau at low metallicity followed by a decreasing of S/Fe with the increasing of Fe/H, until reaching S/Fe at super-solar metallicity. We found that the Galactic bulge is S-rich with respect to both the thick and thin disks at Fe/H, supporting a more rapid formation and chemical evolution of the Galactic bulge than the disk.

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