Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-01-31
Astronomy and Astrophysics
Astrophysics
24pages, 6 figures, accepted for publication in ApJ
Scientific paper
10.1086/318988
The simultaneous presence of both the so-called `ultra-fast rotators' and slowly rotating stars among the solar-type stars ($\sim 0.6-1.2 M_{\odot}$) in the same young star clusters has been a puzzle in the field of stellar rotation. No model to date has been able to explain both by a single mechanism intrinsic to the star and questions about the appropriate initial conditions for models often complicate the problem. In this paper, using the same starting conditions for the models that we used in examining the origin of the ultra-fast rotators in young star clusters, we show that the slowest rotators demand an extrinsic mechanism. Assuming that this mechanism is a disk-star interaction, we determine that a disk-locking timescale of a few Myr must operate for this type of star. If, instead of allowing (radial) differential rotation, we enforce solid-body rotation, the models require timescales about two to three times as long.
Barnes Sydney A.
Pinsonneault Marc H.
Sofia Sabatino
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