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2008MNRAS.384.1263C - Mon. Not. R. Astron. Soc., 384, 1263-1276 (2008/March-2)
Binary coalescence from case A evolution: mergers and blue stragglers.
CHEN X. and HAN Z.
Abstract (from CDS):
Taking the above into account, we performed Monte Carlo simulations to examine our models in an old open cluster NGC 2682 and an intermediate-age cluster NGC 2660. The angular momentum loss (AML) of low-mass binaries is very important in NGC 2682, and its effect can be estimated in a simple way. In NGC 2682, binary mergers from our models cover the region with high luminosity and those from the AML are located in the region with low luminosity, which has a certain width. The blue stragglers from the AML are much more numerous than those from our models, indicating that the AML of low-mass binaries makes a major contribution to blue stragglers in this old cluster. Our models can account for several blue stragglers in NGC 2660. For the most likely region on the colour-magnitude diagram, however, no blue stragglers have yet been observed. Our results are well matched with the observations if there is ∼0.5 M☉ of mass loss in the merger process; however, it is difficult to find a physical mechanism for this much mass loss.
Abstract Copyright: 2008 The Authors. Journal compilation © 2008 RAS
Journal keyword(s): binaries: close - blue stragglers - stars: evolution
Simbad objects: 21
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