Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars : V. Evidence for a wide age distribution and a complex MDF
Bensby, T; Yee, J C; Feltzing, Sofia; Johnson, Jennifer A; Gould, A; Cohen, Judith G; Asplund, Martin; Melendez, Jorge; Lucatello, Sara; Han, C; Thompson, Ian; Gal-Yam, Avishay; Udalski, A; Bennett, D P; Bond, I; Kohei, W
Based on high-resolution spectra obtained during gravitational microlensing events we present a detailed elemental abundance analysis of 32 dwarf and subgiant stars in the Galactic bulge. Combined with the sample of 26 stars from the previous papers in this series, we now have 58 microlensed bulge dwarfs and subgiants that have been homogeneously analysed. The main characteristics of the sample and the findings that can be drawn are: (i) the metallicity distribution (MDF) is wide and spans all...[Show more]
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|Source:||Astronomy and Astrophysics|
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