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Inhibition of Wind-Compressed Disk Inhibition in Optically Thick Winds

Published online by Cambridge University Press:  26 May 2016

K. G. Gayley*
Affiliation:
University of Iowa, 203 Van Allen Hall, Iowa City, IA 52242

Abstract

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There are three important effects in optically thin line-driven winds that have been shown to inhibit the equatorial compression inherent in the wind-compressed disk model:

1) gravity darkening, which concentrates the driving flux over the poles,

2) stellar oblateness, which rotates the flux vectors poleward, and

3) nonisotropic opacity, which rotates the force vectors poleward.

The first two of these effects tend to yield fairly spherical winds, while the last one actually reverses the wind compression and should generate prolate winds. This poster argues that this third mechanism is not present for multiline scattering in Wolf-Rayet winds. Hence, it is argued that rotating optically thick line-driven winds should have a more spherical UV photosphere, especially for CAK α ≅ 2/3. However, owing to flux migration from polar to equatorial regions, such winds should have an even more prolate optical photosphere.

Type
Session 4 Rotation and Stellar Evolution
Copyright
Copyright © Astronomical Society of the Pacific 2004