Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542708a&link_type=abstract
American Astronomical Society, AAS Meeting #215, #427.08; Bulletin of the American Astronomical Society, Vol. 42, p.343
Astronomy and Astrophysics
Astronomy
Scientific paper
A standard model detailed atmosphere for a rapidly rotating star makes the following assumptions: (1) a point-mass approximation of the gravitational potential (a Roche model) and (2) an axially symmetric uniform (non-differential) rotation. These assumptions are not made in the Self-Consistent Field (SCF) models of Jackson et al. (2004, 2005) and MacGregor et al. (2007). The SCF differentially rotating stellar structures use a mass distribution that is fully self consistent with the effective potential, which is the sum of the gravitational potential from Poisson's equation and the centrifugal potential. We investigate whether a SCF model can match observations of the pole-on rapid rotator and photometric standard Vega. Our first models match Vega's equatorial diameter and projected rotation velocity, but are not a very good match to the observed spectral energy distribution (SED). The photospheric shape under anti-solar conservative differential rotation yields a cool equatorial region which leaves the model SED too line blanketed in the ultraviolet. A further exploration of SCF model parameter space is outlined, including changes in the stellar mass, the rate of rotation and the kind and degree of differential rotation.
Aufdenberg Jason Paul
MacGregor Keith B.
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