Two-dimensional particle transport in HgMn and FmAm stars

Details Two-dimensional particle transport in HgMn and FmAm stars Two-dimensional particle transport in HgMn and FmAm stars

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...327..809c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 327, April 15, 1988, p. 809-816. NSERC-supported research.

Statistics

Computation

43

A Stars, Abundance, Particle Motion, Peculiar Stars, Stellar Interiors, Stellar Rotation, Computational Astrophysics, Diffusion Coefficient, Heavy Elements, Interstellar Magnetic Fields

Scientific paper

Detailed two-dimensional diffusion calculations of helium are carried out to determine the maximum equatorial rotational velocity allowing the gravitational settling of He. Once the He abundance has decreased sufficiently in the superficial convection zones, the He convection zone disappears, abundance anomalies become large, and the HgMn and FmAm phenomena appear. The limiting equatorial velocity is found to be 75 and 100 km s-1, respectively, for HgMn and FmAm stars. It depends mainly on gravity, becoming much smaller as soon as gravity goes down. The observed upper limit being ≡100 km s-1, the agreement is quite satisfactory. These results are very similar to those obtained with the one-dimensional approximation and justify the use of those results.

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