A spatially resolved 'inside-out' outburst of IP Pegasi |
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| Authors: | N. A. Webb T. Naylor Z. Ioannou W. J. Worraker J. Stull A. Allan R. Fried N. D. James D. Strange |
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| Affiliation: | Department of Physics, Keele University, Keele, Staffordshire ST5 5BG; 65 Wantage Road, Didcot, Oxfordshire OX11 0AE; Stull Observatory, Alfred University, Alfred, NY 14802, USA; Braeside Observatory, PO Box 906 Flagstaff, AZ 86002, USA; 11 Tavistock Road, Chelmsford, Essex CM1 6JL; Worth Hill Observatory, Worth Matravers, Dorset |
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| Abstract: | We present a comprehensive photometric data set taken over the entire outburst of the eclipsing dwarf nova IP Peg in 1997 September/October. Analysis of the light curves taken over the long rise to the peak-of-outburst shows conclusively that the outburst started near the centre of the disc and moved outwards. This is the first data set that spatially resolves such an outburst. The data set is consistent with the idea that long rise times are indicative of such 'inside-out' outbursts. We show how the thickness and the radius of the disc, along with the mass transfer rate, change over the whole outburst. In addition, we show evidence of the secondary and the irradiation thereof. We discuss the possibility of spiral shocks in the disc; however, we find no conclusive evidence of their existence in this data set. |
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| Keywords: | accretion, accretion discs binaries: eclipsing stars: individual: IP Peg novae, cataclysmic variables white dwarfs infrared: stars |
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