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Post Main-Sequence Changes in Rotational Velocities

Published online by Cambridge University Press:  26 May 2016

Helmut A. Abt
Helmut A. Abt*
Affiliation:
Kitt Peak National Observatory, Box 26732, Tucson, AZ 85726-6732, USA

Abstract

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From recent measurements of the rotational velocities of 1100 B stars and 1700 A stars, we determined the maximum periods of binaries with fully circularized orbits. Combined with published data, we derived the relation of period (days) = 0.001 age0.42 (yr). We were able to reproduce the rotational velocities of giants from v sin i of dwarfs only if rigid body rotation applies to both. However for evolutionary expansions greater than 5 the angular momentum is conserved in shells, which is reasonable physically.

Type
Session 1 Observations of Rotating Stars
Information
Symposium - International Astronomical Union , Volume 215: Stellar Rotation , 2004 , pp. 154 - 155
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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