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A radiation-driven stellar wind model with a line force cutoffThis paper presents a model for a radiation-driven stellar wind in which the driving force is abruptly cut off at an adjustable distance from the star. The model is intended to give a first approximation of the effects of ionizing shocks in a stellar wind on the terminal velocity and mass-loss rate. As expected, the wind velocity is found to decrease after the line force is cut off. The terminal velocity depends directly on the velocity of the wind at the point where the driving force is cut off. The mass-loss rate is found to be unaffected as long as the cutoff is outside the critical point of the flow. The model is applied to the star Tau Sco, a strong X-ray source with an anomalously low terminal velocity. It is shown that this low terminal velocity can be caused by a cutoff of the line force at a distance which is consistent with the idea that the observed X-rate emission is produced by shocks in the wind.
Document ID
19900023749
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Abbott, Mark J.
(Wisconsin Univ. Madison, WI, United States)
Friend, David B.
(Washburn Observatory Madison, WI, United States)
Date Acquired
August 14, 2013
Publication Date
October 1, 1989
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 345
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
90A10804
Funding Number(s)
CONTRACT_GRANT: NAG8-534
CONTRACT_GRANT: NAG8-602
Distribution Limits
Public
Copyright
Other

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