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Gauging the Helium Abundance of the Galactic Bulge RR Lyrae Stars

Marconi, M.; Minniti, D. (Institute of Physics Publishing, 2018)

We report the first estimate of the He abundance of the population of RR Lyrae stars in the Galactic bulge. This is done by comparing the recent observational data with the latest models. We use the large samples of ab-type ...

Oxygen and zinc abundances in 417 Galactic bulge red giants

Da Silveira, C.R.; Barbuy, B.; Friaça, A.C.S.; Hill, V.; Zoccali, M.; Rafelski, M.; Gonzalez, O.A.; Minniti, D.; Renzini, A.; Ortolani, S. (EDP Sciences, 2018)

Context. Oxygen and zinc in the Galactic bulge are key elements for the understanding of the bulge chemical evolution. Oxygen-to-iron abundance ratios provide a most robust indicator of the star formation rate and chemical ...