Self-enrichment in globular clusters. I. An analytic approach

Details Self-enrichment in globular clusters. I. An analytic approach Self-enrichment in globular clusters. I. An analytic approach

2005-02-22

arxiv.org/abs/astro-ph/0502443v1

Astronomy and Astrophysics

Astrophysics

12 pages, 13 figures, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20042275

By means of analytical calculations, we explore the self-enrichment scenario for Globular Cluster formation. According to this scenario, an initial burst of star formation occurs inside the core radius of the initial gaseous distribution. The outward-propagating shock wave sweeps up a shell in which gravitational instabilities may arise, leading to the formation of a second, metal-enriched, population of stars. We find a minimum mass of the proto-globular cluster of the order of 10^6 solar masses. We also find that the observed spread in the Magnitude-Metallicity relation can be explained assuming cluster-to-cluster variations of some parameters like the thermalization efficiency, the mixing efficiency and the Initial Mass Function, as well as variations of the external pressure.

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