Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...582..420a&link_type=abstract
The Astrophysical Journal, Volume 582, Issue 1, pp. 420-422.
Astronomy and Astrophysics
Astronomy
10
Stars: Evolution, Stars: Rotation
Scientific paper
For 1377 dwarfs and 381 giants of types B and A, we present mean observed projected rotational velocities for normal plus abnormal spectral types combined. For the dwarfs, Vsini is statistically constant at 127+/-15 km s-1 from B0 V to A5 V. Using the interior models of Bertelli et al., we predict the rotational velocities of the giants. We assume an age of 30×106 yr for the observed dwarfs. The predicted giant rotational velocities agree well with the observed values if angular momentum is conserved in rigid-body rotation; the observed minus the computed is -7+/-4 km s-1. Significant loss of angular momentum by mass loss (stellar winds) cannot occur because the observed rotational velocities of the giants are already at the maximum level allowed by either conservation mechanism. Comparison with three other studies indicates that angular momentum is conserved by rigid-body rotation if the expansion is less than a factor of 4, but conserved in shells if the expansion is more.
No associations
LandOfFree
Post-Main-Sequence Changes in Rotational Velocities 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 Post-Main-Sequence Changes in Rotational Velocities, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Post-Main-Sequence Changes in Rotational Velocities will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1525761