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Abundances in Galactic Bulge Dwarfs and the Origin of the Elements in the Bulge

Johnson, Jeniffer A. and Gould, Andrew and Gaudi, B. Scott and Cohen, Judith G. and Huang, Wenjin and Gal-Yam, Avishay and Leonard, Douglas C. and Simon, Joshua D. and Udalski, Andrzej and Bond, Ian A. and Sumi, Takahiro (2008) Abundances in Galactic Bulge Dwarfs and the Origin of the Elements in the Bulge. In: 10th Symposium on Nuclei in the Cosmos (NIC X). Proceedings of Science. No.53. SISSA , Trieste, Italy, Art. No. 024.

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The Galactic Bulge has a very different chemical evolution history than the Milky Way disk or halo. The unique mix of supernovae and asymptotic giant branch stars that have contributed to the elements in the bulge offer the opportunity to identify or confirm the nucleosynthesis sites of elements. Abundance measurements based on the spectra of Galactic bulge dwarfs provide the only reliable measurements of the evolution of C and N in the Bulge, and have also been the source of the first measurements of S, K, Zn, Cu and Ba. We report on the use of gravitational microlensing to observe very faint Galactic bulge dwarfs and discuss the implications of these measurements for the origin of the elements. In particular, we argue that Type Ia SNe are unlikely to be important sources of Zn, but while the data on C and N suggest that asymptotic giant stars contributed to the chemical enrichment of the bulge, the data on Ba suggest that there was a delay before substantial AGB star production.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Johnson, Jeniffer A.0000-0001-9808-7172
Gaudi, B. Scott0000-0003-0395-9869
Cohen, Judith G.0000-0002-8039-4673
Gal-Yam, Avishay0000-0002-3653-5598
Udalski, Andrzej0000-0001-5207-5619
Additional Information:Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-ShareAlike.
Series Name:Proceedings of Science
Issue or Number:53
Record Number:CaltechAUTHORS:20180828-122926622
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89249
Deposited By: George Porter
Deposited On:30 Aug 2018 20:48
Last Modified:16 Nov 2021 00:33

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