Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-12-22
Astronomy and Astrophysics
Astrophysics
31 pages, including 13 figures, to appear in ApJ
Scientific paper
10.1086/309220
We present the results of Monte Carlo simulations for the dynamical evolution of star clusters containing two stellar populations with individual masses m1 and m2 > m1, and total masses M1 and M2 < M1. We use both King and Plummer model initial conditions and we perform simulations for a wide range of individual and total mass ratios, m2/m1 and M2/M1. We ignore the effects of binaries, stellar evolution, and the galactic tidal field. The simulations use N = 10^5 stars and follow the evolution of the clusters until core collapse. We find that the departure from energy equipartition in the core follows approximately the theoretical predictions of Spitzer (1969) and Lightman & Fall (1978), and we suggest a more exact condition that is based on our results. We find good agreement with previous results obtained by other methods regarding several important features of the evolution, including the pre-collapse distribution of heavier stars, the time scale on which equipartition is approached, and the extent to which core collapse is accelerated by a small subpopulation of heavier stars. We briefly discuss the possible implications of our results for the dynamical evolution of primordial black holes and neutron stars in globular clusters.
Joshi Kriten J.
Rasio Frederic A.
Watters Wesley Andres
No associations
LandOfFree
Thermal and Dynamical Equilibrium in Two-Component Star Clusters 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 Thermal and Dynamical Equilibrium in Two-Component Star Clusters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermal and Dynamical Equilibrium in Two-Component Star Clusters will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-518555