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High-resolution simulations of stellar collisions between equal-mass main-sequence stars in globular clusters

Sills, A.; Adams, T.; Davies, Melvyn B LU and Bate, M.R. (2002) In Monthly Notices of the Royal Astronomical Society 332. p.49-54
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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
blue stragglers, hydrodynamics, convection, globular clusters: general, stars: rotation
in
Monthly Notices of the Royal Astronomical Society
volume
332
pages
49 - 54
publisher
Wiley-Blackwell
external identifiers
  • Scopus:0041591555
ISSN
1365-2966
language
English
LU publication?
no
id
7f0aa7a7-0f6f-4e4f-a325-e7579800c017 (old id 760882)
alternative location
http://cdsads.u-strasbg.fr/abs/2002MNRAS.332...49S
date added to LUP
2007-12-17 13:36:28
date last changed
2016-10-13 04:45:00
@misc{7f0aa7a7-0f6f-4e4f-a325-e7579800c017,
  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.},
  author       = {Sills, A. and Adams, T. and Davies, Melvyn B and Bate, M.R.},
  issn         = {1365-2966},
  keyword      = {blue stragglers,hydrodynamics,convection,globular clusters: general,stars: rotation},
  language     = {eng},
  pages        = {49--54},
  publisher    = {ARRAY(0x8bddba8)},
  series       = {Monthly Notices of the Royal Astronomical Society},
  title        = {High-resolution simulations of stellar collisions between equal-mass main-sequence stars in globular clusters},
  volume       = {332},
  year         = {2002},
}