Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009pasj...61l..17i&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.61, No.4, pp.L17--L21
Astronomy and Astrophysics
Astronomy
3
Accretion, Accretion Disks, Stars: Dwarf Novae, Stars: Individual (1Rxs J053234+624755), Stars: Novae, Cataclysmic Variables, Stars: Oscillations
Scientific paper
We report on time-resolved CCD photometry of the 2005 March/April superoutburst of a recently confirmed SU UMa-type dwarf nova, 1RXS J053234+624755. The superoutburst was accompanied by a precursor in which conspicuous superhumps were visible from the second night of the precursor. This is a rare example where superhumps were observed during a precursor. Concerning an estimated mass ratio of 0.07 for the system, the present observations contrast with the well-known Lubow relation. We also found that the superhump period increased as the superoutburst proceeded, despite the fact that the superoutburst showed a precursor. If the superhump-period change is closely related to the disk radius of the superoutburst, systems having a small mass ratio could display an increasing superhump period, even if the superoutburst contains a precursor.
Henden Arne A.
Imada Akira
Ishioka Ryoko
Kato Taichi
Moritani Yuuki
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