Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-02-05
Astron.J.133:1092-1103,2007
Astronomy and Astrophysics
Astrophysics
Scientific paper
10.1086/511002
We present the results of a study aimed at assessing the differences in the dis- tribution of rotation speeds, N (v sin i) among young (1-15 Myr) B stars spanning a range of masses 6 < M/M < 12 and located in different environments: 7 low density (rho < 1 M /pc^3) ensembles that are destined to become unbound stellar associations, and 8 high density (rho >> 1 M /pc^3) ensembles that will survive as rich, bound stellar clusters for ages well in excess of 10^8 years. Our results demonstrate (1) that independent of environment, the rotation rates for stars in this mass range do not change by more than 0.1 dex over ages t ~ 1 to t ~ 15 Myr; and (2) that stars formed in high density regions lack the cohort of slow rotators that dominate the low density regions and young field stars. We suggest that the differences in N(v sin i) between low and high density regions may reflect a combination of initial conditions and environmental effects: (1) the higher turbulent speeds that characterize molecular gas in high density, cluster- forming regions; and (2) the stronger UV radiation fields and high stellar densities that characterize such regions.
Dror David
Strom Stephen E.
Wolff Sidney C.
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