Astronomy and Astrophysics – Astronomy
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...499..340d&link_type=abstract
Astrophysical Journal v.499, p.340
Astronomy and Astrophysics
Astronomy
23
Stars: Evolution, Stars: Interiors, Stars: Rotation, Convection, Hydrodynamics
Scientific paper
Intermingled two-dimensional hydrodynamic and two-dimensional stellar evolution calculations are presented for two 8.75 M&sun; models, one nonrotating and one rotating with a zero-age main sequence surface equatorial rotational velocity of 200 km s-1. The first calculation of the rotating model was made assuming no convective core overshooting and enforcing solid-body rotation in the convective core. Hydrodynamic simulations at various stages of core hydrogen burning indicate that neither of these assumptions is true. Overshooting to a distance equivalent to about 0.35 pressure scale heights is found, and there is some evidence that the distance in terms of the pressure scale height increases slightly in later stages of core hydrogen burning. This is not a claim that the pressure scale height is a relevant parameter for determining overshooting distances. The dynamic calculations also show that the rotation rate in the convective core is approximately constant on cylinders and that the rate may be expressed as a power law in the distance from the rotation axis, as long as there is a cutoff at small distances. Two more evolutionary sequences, one rotating and one not, were calculated utilizing these results. The largest effects are produced from the overshooting and are esssentially those found by previous researchers. However, the angular momentum distribution in the interior at the end of core hydrogen burning is significantly different for this second case than for the one assuming solid-body rotation in the convective core. The primary differences are that the horizontal variation in the rotation rate is much larger and that the rotation rate near the center is much higher in the second case.
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