Cataclysmic Variables and Related Objects: Proceedings of by Vik Dhillon (auth.), A. Evans, Janet H. Wood (eds.)

By Vik Dhillon (auth.), A. Evans, Janet H. Wood (eds.)

In 1993 we started to ponder the potential of retaining a convention on Catacysmic Variables (CVs) at Keele collage. there were a number of conferences within the zone of CVs lately (e. g. Eilat, Abano-Padova, Capetown). besides the fact that as arrangements for the Keele assembly improved we learned that, whereas there have been a few IAU conferences dedicated to comparable and to peripheral themes (such as IAU Colloquium 122 on Classical Novae in 1989, IAU Colloquium 129 on Accretion Disks in 1990), there have been no IAU-sponsored meetings within the zone of cataclysmi/: variables (CVs) for a few years. We felt as a result that the time used to be ripe to have an IAU assembly de­ voted to an summary of CVs and similar items and the SOC equipped the convention such that there has been an emphasis on invited studies of the newest advances within the box. The convention lined either CVs and LMXBs and the inter-relations among them. The assembly was once held at a time whilst strong satellite tv for pc observatories, and quick advancements in floor dependent instrumentation, had ended in many advances in either CV and LMXB learn. The convention supplied a discussion board to check observations from ASCA, EUVE, ROSAT, Ginga and the recently-refurbished HST. photograph­ metric, spectroscopic and polarimetric observations of CVs and LMXBs have thrown new mild at the distribution of topic and the character of the stellar elements in those systems.

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Additional resources for Cataclysmic Variables and Related Objects: Proceedings of the 158th Colloquium of the International Astronomical Union, Held at Keele, United Kingdom, June 26–30, 1995

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F. WELSH, J. H. WOOD, K. HORNE averaged. Its main disadvantage is the difficulty of separating the rapid flickering fluctuations from the rapid variations due to the eclipse itself. Just as flickering contaminates the mean eclipse light curve when studying the steady disc, so too will the disc eclipse contaminate the study of the flickering; in the end, one must exercise extreme care. Horne & Stiening [4] laid the foundation of the 'ensemble' method: the flickering light curve is defined as the rms of the residuals of the individual light curves relative to the mean light curve at each orbital phase.

RUTTEN 5 , R. A. WADE 6 , 1. Space Telescope Science Institute, USA 2. University of St. Andrews, Scotland, UK 3. Goddard Space Flight Center, USA 4. Lawrence Livermore Nat. , USA 5. Royal Greenwich Observatory, Teneri[e, Canary Islands 6. Pennsylvania State University, USA Abstract. We report first results of the HST /FOS time-resolved, lowresolution spectroscopy of the eclipsing cataclysmic variable UX UMa, including multi-wavelength mapping of its accretion disk in the ultraviolet region. 1.

The hot spot contributes a negligible amount of flickering. Study 2: The spectrum of the flickering Predictions of a simple model Assuming that flickering arises from dynamical time-scale processes, we have attempted to model the flickering by extending the standard steadystate accretion disc model in the simplest possible way, giving it a time dependency. This was accomplished by allowing small sinusoidal temperature variations about the local steady-state temperature: T(r, t) = To(r)[l + A sin(21l't/T'Kep)] , STUDIES IN FLICKERING 31 where To( r) ()( r- 3 / 4 and 'TKep is the local Keplerian time-scale ()( r 3 / 2 ).

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