The ‘outside-in’ outburst of HT Cassiopeiae

Autor: Tim Naylor, W. F. Welsh, Zach Ioannou, M. S. Catalán, N. D. James, W. J. Worraker
Rok vydání: 1999
Předmět:
Zdroj: Monthly Notices of the Royal Astronomical Society. 310:398-406
ISSN: 1365-2966
0035-8711
Popis: We present results from photometric observations of the dwarf nova system HT Cas during the eruption of November 1995. The data include the first two--colour observations of an eclipse on the rise to outburst. They show that during the rise to outburst the disc deviates significantly from steady state models, but the inclusion of an inner-disc truncation radius of about 4 $R_{wd}$ and a ``flared'' disc of semi-opening angle of $10^{\circ}$ produces acceptable fits. The disc is found to have expanded at the start of the outburst to about $0.41R_{L1}$, as compared to quiescent measurements. The accretion disc then gradually decreases in radius reaching $
9 pages, 11 figures, to appear in MNRAS
Databáze: OpenAIRE