Superhumps in V348 Pup |
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| Authors: | Daniel J Rolfe Carole A Haswell Joseph Patterson |
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| Institution: | Department of Physics and Astronomy, The Open University, Walton Hall, Milton Keynes MK7 6AA;Department of Astronomy, Columbia University, 538 W. 120th Street, New York, NY 10027, USA |
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| Abstract: | The eclipsing nova-like cataclysmic variable star V348 Pup exhibits a persistent luminosity modulation with a period 6 per cent longer than its 2.44-h orbital period ( P orb). This has been interpreted as a 'positive superhump' resulting from a slowly precessing non-axisymmetric accretion disc gravitationally interacting with the secondary. We find a clear modulation of mid-eclipse times on the superhump period, which agrees well with the predictions of a simple precessing eccentric disc model. Our modelling shows that the disc light centre is on the far side of the disc from the donor star when the superhump reaches maximum light. This phasing suggests a link between superhumps in V348 Pup and late superhumps in SU UMa systems. Modelling of the full light curve and maximum entropy eclipse mapping both show that the disc emission is concentrated closer to the white dwarf at superhump maximum than at superhump minimum. We detect additional signals consistent with the beat periods between the implied disc precession period and both and |
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| Keywords: | accretion accretion discs binaries: close binaries: eclipsing stars: individual: V348 Pup novae cataclysmic variables |
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