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Title:
X-ray emission from the winds of hot stars. II
Authors:
Lucy, L. B.
Affiliation:
AA(Columbia University, New York, NY)
Publication:
Astrophysical Journal, Part 1, vol. 255, Apr. 1, 1982, p. 286-292. (ApJ Homepage)
Publication Date:
04/1982
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Hot Stars, Shock Waves, Stellar Radiation, Stellar Winds, X Ray Spectra, Early Stars, Stellar Models
DOI:
10.1086/159827
Bibliographic Code:
1982ApJ...255..286L

Abstract

Equations are derived governing the structure and X-ray emission characteristics of a phenomenological model for the limiting amplitude state reached by unstable line-driven winds. Expressions for the equation of motion, shock speed, mass flux, radiative driving, shock spacing, X-ray emission, and efficiency are stated. Radiatively driven shocks are conjectured to result from the amplification of unstable waves and to survive until shadowing by following shocks compels their decay. X-ray emission is predicted to continue far out into the nearly terminal flow, with the effects of self-absorption not expected to be prominent. The theory is used to discuss briefly the time-averaged velocity law for winds and then to calculate models and X-ray luminosities for individual stars.

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