Oxygen and zinc abundances in 417 Galactic bulge red giants
| Autor: | 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. |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Astronomy & Astrophysics, 2018 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1051/0004-6361/201730562 |
| Popis: | 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 evolution of the bulge. Zinc is enhanced in metal-poor stars, behaving as an $\alpha$-element, and its production may require nucleosynthesis in hypernovae. Most of the neutral gas at high redshift is in damped Lyman-alpha systems (DLAs), where Zn is also observed to behave as an alpha-element. The aim of this work is the derivation of the alpha-element oxygen, together with nitrogen, and the iron-peak element zinc abundances in 417 bulge giants, from moderate resolution (R~22,000) FLAMES-GIRAFFE spectra. For stars in common with a set of UVES spectra with higher resolution (R~45,000), the data are intercompared. The results are compared with literature data and chemodynamical models. Comment: accepted on 21/02/2018 |
| Databáze: | arXiv |
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