The SU UMa Nature of the Dwarf Nova, DM Lyrae
Abstract
We carried out time-resolved V-band photometry of DM Lyr during long outbursts in 1996 July and in 1996 February-March at Ouda Station, Kyoto University, and at Osaka Kyoiku University. Since superhumps were clearly detected in the light curves, DM Lyr was first identified as being an SU UMa-type dwarf nova. The superhump period is 0.0673(2)d, and the superhump excess is 2.8(3)&. The duration of the superoutburst, the outburst amplitude, the decline rate in the plateau phase, and the superhump excess were typical values for a usual SU UMa star.According to visual and CCD observations reported to VSNET, this star has experienced a dramatic change of the outburst pattern from a superoutburst phase to a normal outburst phase. There may exist mechanisms to decrease the number of normal outbursts between two successive superoutbursts and to elongate the recurrence cycle of the superoutburst.
- Publication:
-
Publications of the Astronomical Society of Japan
- Pub Date:
- April 2003
- DOI:
- 10.1093/pasj/55.2.483
- arXiv:
- arXiv:astro-ph/0301036
- Bibcode:
- 2003PASJ...55..483N
- Keywords:
-
- accretion;
- accretion disks;
- stars: dwarf novae;
- stars: individual (DM Lyrae);
- stars: novae;
- cataclysmic variables;
- Astrophysics
- E-Print:
- 6 pages, 5 figures, accepted for publication in PASJ