Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-09-11
Astrophys.J.673:847-853,2008
Astronomy and Astrophysics
Astrophysics
Accepted for publication in The Astrophysical Journal
Scientific paper
10.1086/523346
There is a growing evidence that several globular clusters must contain multiple stellar generations, differing in helium content. This hypothesis has helped to interpret peculiar unexplained features in their horizontal branches. In this framework we model the peaked distribution of the RR Lyr periods in M3, that has defied explanation until now. At the same time, we try to reproduce the colour distribution of M3 horizontal branch stars. We find that only a very small dispersion in mass loss along the red giant branch reproduces with good accuracy the observational data. The enhanced and variable helium content among cluster stars is at the origin of the extension in colour of the horizontal branch, while the sharply peaked mass loss is necessary to reproduce the sharply peaked period distribution of RR Lyr variables. The dispersion in mass loss has to be <~ 0.003 Msun, to be compared with the usually assumed values of ~0.02 Msun. This requirement represents a substantial change in the interpretation of the physical mechanisms regulating the evolution of globular cluster stars.
Caloi Vittoria
D'Antona Francesca
No associations
LandOfFree
Is mass loss along the red giant branch of globular clusters sharply peaked? The case of M3 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Is mass loss along the red giant branch of globular clusters sharply peaked? The case of M3, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Is mass loss along the red giant branch of globular clusters sharply peaked? The case of M3 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-392154