Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-06-28
Mon.Not.Roy.Astron.Soc. 309 (1999) 847-861
Astronomy and Astrophysics
Astrophysics
16 pages, 14 figures, accepted for publication in MNRAS
Scientific paper
10.1046/j.1365-8711.1999.02900.x
We present ROSAT X-ray and optical light curves of the 1994 February superoutburst of the eclipsing SU UMa dwarf nova OY Carinae. There is no eclipse of the flux in the ROSAT HRI light curve. Contemporaneous `wide B' band optical light curves show extensive superhump activity and dips at superhump maximum. Eclipse mapping of these optical light curves reveals a disc with a considerable physical flare, even three days into the superoutburst decline. We include a later (1994 July) ROSAT PSPC observation of OY Car that allows us to put constraints on the quiescent X-ray spectrum. We find that while there is little to choose between OY Car and its fellow high inclination systems with regard to the temperature of the emitting gas and the emission measure, we have difficulties reconciling the column density found from our X-ray observation with the column found in HST UV observations by Horne et al. (1994). The obvious option is to invoke time variability.
Hassall B. J. M.
Naylor Tim
Patterson Jaclyn
Pratt Gabriel W.
Wood Janet H.
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