Other
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...258..349m&link_type=abstract
Astrophysical Journal, Part 1, vol. 258, July 1, 1982, p. 349-353.
Other
46
A Stars, Gaseous Diffusion, Meridional Flow, Peculiar Stars, Stellar Envelopes, Stellar Rotation, Circulation Distribution, Convective Flow, Helium, Velocity Distribution
Scientific paper
Tassoul and Tassoul (1982) have recently obtained self-consistent solutions for meridional circulation throughout chemically homogeneous stars. The meridional circulation velocities they determined are here compared to diffusion velocities of helium below the He II convection zone. It is shown that the He II convection zone can disappear only in stars with equatorial rotational velocities smaller than 90 km/s. This is in agreement with the cutoff velocity observed for the HgMn stars. This maximum velocity for the disappearance of the He II convection zone depends sensitively on gravity so that there is not one equatorial rotational velocity below which all stars should become HgMn. It depends on the evolutionary status and on how the star was slowed down. On the other hand, the rotational motion is turbulent, and the effect this turbulence has on chemical separation is poorly known.
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