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Massive binaries and the enrichment of the interstellar medium in globular clusters

Published online by Cambridge University Press:  18 January 2010

S. E. de Mink ,
O. R. Pols ,
N. Langer  and
R. G. Izzard
S. E. de Mink
Affiliation:
Astronomical Institute Utrecht, Postbus 80000, 3508 TA Utrecht, The Netherlands email: S.E.deMink@uu.nl
O. R. Pols
Affiliation:
Astronomical Institute Utrecht, Postbus 80000, 3508 TA Utrecht, The Netherlands email: S.E.deMink@uu.nl
N. Langer
Affiliation:
Astronomical Institute Utrecht, Postbus 80000, 3508 TA Utrecht, The Netherlands email: S.E.deMink@uu.nl Argelander-Institut für Astronomie, Auf dem Hügel 71, 53121 Bonn, Germany
R. G. Izzard
Affiliation:
Université Libre de Bruxelles, Boulevard du Triomphe, B-1050 Brussels, Belgium
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Abstract

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Abundance anomalies observed in globular cluster stars indicate pollution with material processed by hydrogen burning. Two main sources have been suggested: asymptotic giant branch (AGB) stars and massive stars rotating near the break-up limit (spin stars). We discuss the idea that massive binaries may provide an interesting alternative source of processed material. We discuss observational evidence for mass shedding from interacting binaries. In contrast to the fast, radiatively driven winds of massive stars, this material is typically ejected with low velocity. We expect that it remains inside the potential well of a globular cluster and becomes available for the formation or pollution of a second generation of stars. We estimate that the amount of processed low-velocity material that can be ejected by massive binaries is larger than the contribution of the two previously suggested sources combined.

Keywords

globular clustersbinaries: closestars: abundancesISM: jets and outflows
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S266: Star clusters: basic galactic building blocks throughout time and space , August 2009 , pp. 169 - 174
Copyright
Copyright © International Astronomical Union 2010

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