Fluorine Abundances in the Milky Way Bulge

  • Cunha K
  • Smith V
  • Gibson B
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Abstract

Fluorine (19 F) abundances are derived in a sample of six bulge red giants in Baade’s window. These giants span a factor of 10 in metallicity, and this is the first study to define the behavior of 19 F with metallicity in the bulge. The bulge results show an increase in F/O with increasing oxygen. This trend overlaps what is found in the disk at comparable metallicities, with the most oxygen-rich bulge target extending the disk trend. The increase in F/O in the disk arises from 19 F synthesis in both asymptotic giant branch (AGB) stars and metal-rich Wolf- Rayet (WR) stars through stellar winds. The lack of an s-process enhancement in the most fluorine-rich bulge giant in this study suggests that WR stars represented a larger contribution than did AGB stars to 19 F production in the bulge, when compared to the disk. If this result for fluorine is combined with the previously published overall decline in the O/Mg abundance ratios in metal-rich bulge stars, it suggests that WR winds played a role in shaping chemical evolution in the bulge. One star in this study exhibits a very low value of F/O while having a large O abundance; this chemical mixture can be understood if this star formed from gas that was enriched by metal-poor core-collapse supernovae, and it may indicate that chemical evolution in the bulge was inhomogeneous.

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Cunha, K., Smith, V. V., & Gibson, B. K. (2008). Fluorine Abundances in the Milky Way Bulge. The Astrophysical Journal, 679(1), L17–L20. https://doi.org/10.1086/588816

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