The age and abundance structure of the stellar populations in the central sub-kpc of the Milky Way
Date Issued
2018
Author(s)
Bensby, T.
•
Feltzing, S.
•
Gould, A.
•
Yee, J. C.
•
Johnson, J. A.
•
Asplund, M.
•
Meléndez, J.
•
•
Howes, L. M.
Abstract
The four main findings about the age and abundance structure of the Milky Way bulge based on microlensed dwarf and subgiant stars are: (1) a wide metallicity distribution with distinct peaks at [Fe/H] = -1.09, -0.63, -0.20, +0.12, +0.41; (2) a high fraction of intermediate-age to young stars where at [Fe/H] > 0 more than 35 % are younger than 8 Gyr, (3) several episodes of significant star formation in the bulge 3, 6, 8, and 11 Gyr ago; (4) the `knee' in the α-element abundance trends of the sub-solar metallicity bulge appears to be located at a slightly higher [Fe/H] (about 0.05 to 0.1 dex) than in the local thick disk.
Coverage
Rediscovering Our Galaxy
All editors
Chiappini, C.; Minchev, I.; Starkenburg, E.; Valentini, M.
Volume
334
Start page
86
Conferenece
Rediscovering Our Galaxy
Conferenece place
Potsdam, Germany
Conferenece date
10-14 July, 2017
Issn Identifier
1743-9213
Ads BibCode
2018IAUS..334...86B
Rights
open.access
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