Other
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...420..797c&link_type=abstract
The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 420, no. 2, p. 797-802
Other
11
Main Sequence Stars, Stellar Cores, Stellar Interiors, Stellar Models, Stellar Rotation, Angular Momentum, Angular Velocity, Gravitational Collapse, Momentum Transfer, Stellar Envelopes
Scientific paper
Accurate two-dimensional models of rotating main-sequence stars have been computed to test the recently proposed hypothesis that stars with a uniform distribution of specfic angular momentum have more massive convective cores and, therefore, longer lifetimes than their rigidly rotating and nonrotating counterparts. The main conclusion is that the numerical models do, indeed, confirm this hypothesis at least for stars with masses below 12 solar mass. Hence, this phenomenon provides yet another possible explanation for intermediate mass blue stragglers and other peculiar stars that may arise from enhanced core-envelope mixing. In more massive configurations, the radiative temperature gradient at the core boundary also increases with an increase in rotation (as in the lower masses) but the adiabatic gradient increases by an even larger amount due to a drop in the radiation pressure. Thus, the convective cores of rotating massive stars always decrease in mass fraction for any distribution of angular velocity.
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