Applicability of steady models for hot-star windsNon-Sobolev models of radiatively driven stellar winds based on a pure-absorption approximation do not have a well-defined steady state. Here the implications of this for flow time-dependence are examined, showing that, under such circumstances, instabilities in the flow attain an absolute character that leads to intrinsic variability. In this case, steady solutions are inherently inapplicable because they do not represent physically realizable states. However, for actual hot-star winds, driving is principally by scattering, not pure absorption. In practice, the relatively weak force associated with slight asymmetries in the diffuse, scattered radiation field may play a crucial role in breaking the solution degeneracy and reducing the instability from an absolute to an advective character.
Document ID
19900049832
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Owocki, Stanley P. (Bartol Research Institute Newark, DE, United States)
Poe, Clint H. (High Altitude Observatory Boulder, CO, United States)
Castor, John I. (Lawrence Livermore National Laboratory Livermore, CA, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1990
Subject Category
Astrophysics
Meeting Information
Meeting: Boulder-Munich Workshop on Hot Luminous Stars