On the origin of complex stellar populations in star clusters

Details On the origin of complex stellar populations in star clusters On the origin of complex stellar populations in star clusters

2007-09-12

arxiv.org/abs/0709.1943v1

Astronomy and Astrophysics

Astrophysics

2 pages, 3 figures, To be published in the proceedings of IAUS246 "Dynamical Evolution of Dense Stellar Systems", ed. E. Vespe

Scientific paper

10.1017/S1743921308015330

The existence of complex stellar populations in some star clusters challenges the understanding of star formation. E.g. the ONC or the sigma Orionis cluster host much older stars than the main bulk of the young stars. Massive star clusters (omega Cen, G1, M54) show metallicity spreads corresponding to different stellar populations with large age gaps. We show that (i) during star cluster formation field stars can be captured and (ii) very massive globular clusters can accrete gas from a long-term embedding inter stellar medium and restart star formation.

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