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Title:
Red giant depletion in globular cluster cores
Authors:
Beer, Martin E.; Davies, Melvyn B.
Affiliation:
AA(Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH), AB(Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 348, Issue 2, pp. 679-686. (MNRAS Homepage)
Publication Date:
02/2004
Origin:
MNRAS
Astronomy Keywords:
binaries: close, stars: evolution, stars: general, globular clusters: general
DOI:
10.1111/j.1365-2966.2004.07380.x
Bibliographic Code:
2004MNRAS.348..679B

Abstract

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 stellar encounters enhance this evolutionary route in post-core-collapse clusters. These encounters increase the population of binary secondaries which would have evolved on to the red giant branch in the recent past.

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