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Title:
High-resolution simulations of stellar collisions between equal-mass main-sequence stars in globular clusters
Authors:
Sills, Alison; Adams, Tim; Davies, Melvyn B.; Bate, Matthew R.
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), AC(Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH), AD(School of Physics, University of Exeter, Exeter EX4 4QL)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 332, Issue 1, pp. 49-54. (MNRAS Homepage)
Publication Date:
05/2002
Origin:
MNRAS
Astronomy Keywords:
convection, hydrodynamics, blue stragglers, stars: rotation, globular clusters: general
DOI:
10.1046/j.1365-8711.2002.05266.x
Bibliographic Code:
2002MNRAS.332...49S

Abstract

We performed high-resolution simulations of two stellar collisions relevant for stars in globular clusters. We considered one head-on collision and one off-axis collision between two 0.6-Msolar main-sequence stars. We show that a resolution of about 100000 particles is sufficient for most studies of the structure and evolution of blue stragglers. We demonstrate conclusively that collision products between main-sequence stars in globular clusters do not have surface convection zones larger than 0.004Msolar after the collision, nor do they develop convection zones during the `pre-main-sequence' thermal relaxation phase of their post-collision evolution. Therefore, any mechanism which requires a surface convection zone (i.e. chemical mixing or angular momentum loss via a magnetic wind) cannot operate in these stars. We show that no disc of material surrounding the collision product is produced in off-axis collisions. The lack of both a convection zone and a disc proves a continuing problem for the angular momentum evolution of blue stragglers in globular clusters.

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