Abstract
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.
Publisher
Cambridge University Press (CUP)