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Home List of Titles Extragalactic globular clusters: unraveling galaxy formation and constraining stellar evolution theories
Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/37190
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- Extragalactic globular clusters: unraveling galaxy formation and constraining stellar evolution theories
- Cenarro, A. Javier; Beasley, Michael A.; Strader, Jay; Brodie, Jean P.; Forbes, Duncan A.
- Understanding the stellar populations of extragalactic globular cluster (GC) systems and, in particular, determining their ages, provide essential clues to constrain the star formation histories of their host galaxies. We here summarize the most relevant results derived from a detailed, spectroscopic study of 20 GCs in the E0 NGC 1407. We find most GCs are old (~11 Gyr), follow a tight metallicity sequence reaching values slightly above solar, and exhibit mean [α/Fe] ratios of ~0.3 dex. Blue horizontal branch effects are detected for 3 GCs. We also report the existence of two families of metal-rich (MR) GCs, as some of them exhibit significantly larger [Mg/Fe] and [C/Fe] ratios, what might be interpreted in terms of different star formation time-scales. Striking CN overabundances are found over the entire GC metallicity range. In particular, for MR GCs, N increases dramatically while C essentially saturates. This may be interpreted as a consequence of the increasing importance of the CNO cycle with increasing metallicity.
- Publication type
- Conference paper
- Research centre
- Swinburne University of Technology. Faculty of Information and Communication Technologies. Centre for Astrophysics and Supercomputing
- Proceedings of the International Astronomical Union Symposium S241: Stellar Populations as Building Blocks of Galaxies, La Palma, Canary Islands, Spain, 10-14 December 2006 / Alexandre Vazdekis and Reynier Peletier (eds.), Vol. 2, pp. 445-448
- Publication year
- Galaxy formation; GCs; Globular clusters
- Cambridge University Press
- Publisher URL
- Copyright © International Astronomical Union 2007. Published version of the paper reproduced here in accordance with the copyright policy of the publisher.
- Full text
- Peer reviewed