Evolutionary models of halo stars with rotation. I - Evidence for differential rotation with depth in stars

Details Evolutionary models of halo stars with rotation. I - Evidence for differential rotation with depth in stars Evolutionary models of halo stars with rotation. I - Evidence for differential rotation with depth in stars

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...367..239p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 367, Jan. 20, 1991, p. 239-252.

Astronomy and Astrophysics

Astrophysics

66

Halos, Horizontal Branch Stars, Stellar Evolution, Stellar Interiors, Stellar Models, Stellar Rotation, Angular Momentum, Main Sequence Stars, Metallic Stars, Stellar Mass Ejection

Scientific paper

Evolutionary models of metal-poor stars are computed including the effects of rotation, and their properties are compared with observations. The models rotate slowly at the surface, in agreement with the observed upper limits on the rotation velocity at main-sequence turnoff; they also have substantial differential rotation with depth. This differential rotation preserves a sufficient amount of internal angular momentum to explain the rapid rotation of evolved horizontal-branch stars. These results hold for a wide range of angular momentum loss and transport parameter values. Differences and similarities between the surface and internal rotation of solar metallicity and metal-poor models are discussed. Rigidly rotating models are found to be incompatible with the observations once giant branch mass loss is taken into account. Horizontal-branch rotation velocity measurements as a function of color are proposed as a test of the rotation law enforced in convection zones, and their dependence on cluster age and metallicity are discussed.

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