Red giant depletion in globular cluster cores

Details Red giant depletion in globular cluster cores Red giant depletion in globular cluster cores

2003-01-23

arxiv.org/abs/astro-ph/0301472v1

Mon.Not.Roy.Astron.Soc. 348 (2004) 679

Astronomy and Astrophysics

Astrophysics

6 pages, 5 figures, submitted to MNRAS

Scientific paper

10.1111/j.1365-2966.2004.07380.x

We investigate the observed depletion of red giants in the cores of post-core-collapse globular clusters. In particular, the evolutionary scenario we consider is a binary consisting of two low-mass stars which undergoes two common envelope phases. The first common envelope phase occurs when the primary is a red giant resulting in a helium white dwarf and main sequence star in a detached binary. The second common envelope phase occurs shortly after the secondary becomes a red giant. During the second common envelope phase the degenerate helium cores merge resulting in a core mass greater than the helium burning limit and the formation of a horizontal branch star. We show that this evolutionary route is enhanced in post-core-collapse clusters by stellar encounters. These encounters increase the population of binary secondaries which would have evolved onto the red giant branch in the recent past.

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