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Terzan 5: a pristine fragment of the Bulge

Published online by Cambridge University Press:  05 March 2015

Francesco R. Ferraro
Francesco R. Ferraro*
Affiliation:
Dipartimento di Fisica e Astronomia, Università di Bologna (Italy) email: [email protected]
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Abstract

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We have discovered that Terzan 5, a stellar system in the Galactic Bulge, harbors two stellar populations with different iron content (Δ[Fe/H] ~ 0.5 dex) and possibly different ages. Moreover, the observed chemical patterns significantly differ from those observed in any known genuine globular cluster. These evidences demonstrate that, similarly to ω Centauri in the Halo, Terzan 5 is not a globular cluster, but a stellar system that was able to retain the gas ejected by violent supernova explosions. Moreover the striking chemical similarity with the Bulge stars suggests that Terzan 5 could be the relic of one of the massive clumps that contributed (through strong dynamical interactions with other pre-formed and internally-evolved sub-structures) to the formation of the Galactic Bulge.

Keywords

Stars: abundancesGlobular clusters: individual (Terzan 5)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Highlights H16: Highlights of Astronomy , August 2012 , pp. 243 - 244
Copyright
Copyright © International Astronomical Union 2015 

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