Title: The effect of oblateness and gravity darkening on the radiation driving in winds from rapidly rotating B stars
Abstract: view Abstract Citations (104) References (42) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Effect of Oblateness and Gravity Darkening on the Radiation Driving in Winds from Rapidly Rotating B Stars Cranmer, Steven R. ; Owocki, Stanley P. Abstract We calculate the radiative driving force for winds around rapidly rotating oblate B stars, and we estimate the impact these forces should have on the production of a wind compressed disk. The effects of limb darkening, gravity darkening, oblateness, and an arbitrary wind velocity field are included in the computation of vector 'oblate finite disk' (OFD) factors, which depend on both radius and colatitude in the wind. The impact of limb darkening alone, with or without rotation, can increase the mass loss by as much as 10% over values computed using the standard uniformly bright spherical finite disk factor. For rapidly rotating stars, limb darkening makes 'sub-stellar' gravity darkening the dominant effect in the radial and latitudinal OFD factors, and lessens the impact of gravity darkening at other visible latitudes (nearer to the oblate limb). Thus, the radial radiative driving is generally stronger over the poles and weaker over the equator, following the gravity darkening at these latitudes. The nonradial radiative driving is considerably smaller in magnitude than the radial component, but is directed both away from the equatorial plane and in a retrograde azimuthal direction, acting to decrease the effective stellar rotation velocity. These forces thus weaken the equatorward wind compression compared to wind models computed with nonrotating finite disk factors. Publication: The Astrophysical Journal Pub Date: February 1995 DOI: 10.1086/175272 Bibcode: 1995ApJ...440..308C Keywords: B Stars; Gravitational Effects; Limb Darkening; Oblate Spheroids; Radiative Transfer; Stellar Envelopes; Stellar Models; Stellar Rotation; Stellar Winds; Mathematical Models; Stellar Gravitation; Velocity Distribution; Wind Velocity; Astrophysics; STARS: CIRCUMSTELLAR MATTER; RADIATIVE TRANSFER; STARS: EARLY-TYPE; STARS: MASS LOSS; STARS: ROTATION full text sources ADS |