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2000MNRAS.312..316P - Mon. Not. R. Astron. Soc., 312, 316-326 (2000/February-3)
HST ultraviolet observations of rapid variability in the accretion-disc wind of BZ Cam.
PRINJA R.K., RINGWALD F.A., WADE R.A. and KNIGGE C.
Abstract (from CDS):
Aside from the incidence of enormous line-profile changes on remarkably short time-scales, BZ Cam provides an important benchmark for the simultaneous presence of very strong absorption and well-developed emission components in Siiv, Ciii and Civ, for an estimated low-inclination (i<40°) or possibly even face-on system. We illustrate the problems posed for pure-scattering line-synthesis models in matching the UV line profiles of BZ Cam, and set constraints for alternative thermal emission sources.
A phenomenological interpretation is that the high-speed wind of BZ Cam is highly irregular in nature, and the outflow is riddled with structure arising from localized density enhancements. It is tempting to link our empirical results to recent hydrodynamic simulations of unsteady radiatively driven accretion-disc winds, such as those of Proga, Drew & Stone. Ultimately, line profiles synthesized from the hydrodynamic codes would have to match the substantial absorption equivalent width changes in the UV lines of BZ Cam, over the very short flow times across the line formation regions, i.e. the overall contribution of the, structured, disc-projected wind has to be substantially variable.
Abstract Copyright: Blackwell Science Ltd
Journal keyword(s): accretion, accretion discs - stars: individual: BZ Cam - stars: mass-loss - novae, cataclysmic variables - ultraviolet: stars
Simbad objects: 7
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