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Evolution of an Accretion Disk in the Symbiotic Binary CI Cyg

Published online by Cambridge University Press:  12 April 2016

Joanna Mikołajewska
Joanna Mikołajewska*
Affiliation:
Copernicus Astronomical Center, Bartycka 18, PL-00716 Warsaw, Poland

Abstract

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We have combined IUE spectra with optical spectroscopic and photometric data collected over a few orbits of the symbiotic binary CI Cyg to follow the evolution of a disk and boundary layer during a full activity cycle. Our results indicate an extended optically thin disk during quiescent periods, which evolves into an optically thick state in an eruption; a classical boundary layer at the inner edge of the disk ionizes a surrounding H II region in quiescence, and this emission fades during the rise to visual maximum in outburst. This evolution of Ṁ rivals that observed in classical CVs and pre-main sequence stars, so symbiotic systems like CI Cyg represent another opportunity to study the physics of disk accretion.

Type
Novae & Symbiotic Stars
Information
International Astronomical Union Colloquium , Volume 158: Cataclysmic Variables and Related Objects , 1996 , pp. 335 - 338
Copyright
Copyright © Kluwer 1996

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