OY Carinae revisited - Development of the accretion disk during a normal outburst

Details OY Carinae revisited - Development of the accretion disk during a normal outburst OY Carinae revisited - Development of the accretion disk during a normal outburst

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...265..159r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 265, no. 1, p. 159-167.

Physics

42

Accretion Disks, Cataclysmic Variables, Dwarf Novae, Stellar Physics, Stellar Spectrophotometry, Brightness Temperature, Light Curve, Maximum Entropy Method, Stellar Models, Stellar Temperature

Scientific paper

The maximum-entropy eclipse-mapping technique is employed to reanalyze Vogt's (1983) unique set of white-light eclipse light curves of the dwarf nova OY Carinae during a normal outburst. The radial brightness profile and brightness temperature profile of the disk during the rise to outburst maximum are presented and discussed in the light of theoretical outburst models; from the observed stability of the disk radius and from the absence of an increase in the luminosity of the bright spot, it is concluded that the current observations do not support the mass-transfer instability model. This analysis suggests the development of an extra, uneclipsed component during outburst rise, which contributes up to 15 percent of the total light at outburst maximum. It is argued that this extra component most likely represents luminous material well above the orbital plane, which may indicate the devlopment of a wind.

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