Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.198..795g&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 198, Mar. 1982, p. 795-810.
Astronomy and Astrophysics
Astronomy
18
B Stars, Late Stars, Star Clusters, Statistical Distributions, Stellar Rotation, Velocity Distribution, Axes Of Rotation, Histograms, Interstellar Matter, Magnetic Stars, Maxwell-Boltzmann Density Function, Stellar Evolution, Tides
Scientific paper
An examination of projected rotational velocities for 195 late B-type stars, in 13 low galactic latitude clusters, shows a bimodal overall distribution with scarcity values between 80 and 160 km/sec. The projected rotational velocity distribution for field stars is not bimodal and does not depend on galactic latitude, consistent with a random orientation of rotational axes and a Maxwellian initial distribution. Cluster stars may have been formed through the collapse and fragmentation of large gas clouds, while field stars may have been created in loose clusters through turbulence in smaller gas clouds. The proportion of slow rotators increases with age in both star types, due in part to tidal braking in binaries and rapid braking of magnetic stars through interaction with interstellar clouds.
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