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IUE Observations of HL CMa and the Winds of Cataclysmic Variables

Published online by Cambridge University Press:  12 April 2016

C.W. Mauche  and
J.C. Raymond
C.W. Mauche
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, U.S.A.
J.C. Raymond
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, U.S.A.

Abstract

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As evidenced by the P Cygni profiles of their ultraviolet resonance lines, cataclysmic variables—like early-type stars—are known to have extensive, high velocity winds. Assisted by AAVSO visual data and IUE ultraviolet spectra, we present an observational and theoretical study of the P Cygni profiles of the dwarf nova HL CMa. As these profiles are dependent upon the ionization structure of the wind, we describe a model of a radiatively-driven shocked wind for cataclysmic variables, and present results for the temperature and ionization structure of the outflowing gas.

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