Structural Models for Stars with Solar-like Differential Rotation

Details Structural Models for Stars with Solar-like Differential Rotation Structural Models for Stars with Solar-like Differential Rotation

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21340611m&link_type=abstract

American Astronomical Society, AAS Meeting #213, #406.11; Bulletin of the American Astronomical Society, Vol. 41, p.200

Astronomy and Astrophysics

Astronomy

Scientific paper

Rapid rotation can profoundly affect the structure of stars, changing basic stellar properties like the radiative luminosity and effective temperature and causing the photospheric shape to deviate from sphericity. We have computed a grid of models for chemically homogeneous, uniformly and differentially rotating stars with masses in the range from 1 to 2 solar masses, using a recently developed method for obtaining fully consistent solutions to the equations governing the stellar structure and gravitational potential. A reformulation of the so-called self-consistent field method, this new approach yields two-dimensional, axisymmetric, equilibrium configurations for conservative rotation laws (i.e., internal angular velocity distributions with the property that the associated centrifugal acceleration can be derived from a potential). We present results for 1 and 2 solar-mass models with solar-like differential rotation profiles in which the stellar equator rotates more rapidly than the poles. The models have flattened, oblate shapes with equatorial (polar) radii that are larger (smaller) than the radius of the corresponding non-rotating models. Rotationally induced modifications of the thermodynamic conditions in the deep interior lead to reduced luminosities, and the model surface temperature distributions are latitude-dependent with polar (equatorial) regions that are hotter (cooler) than the effective temperature of a non-rotating model for the same mass. We compare the properties of these models with those of previously computed 1 and 2 solar-mass models having anti-solar differential rotation (MacGregor et al. 2007), and enumerate several possible consequences of the structural changes arising from rapid rotation. NCAR is sponsored by the National Science Foundation.

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