Discovery of ``Super-Quasi-Periodic Oscillations" during Superoutburst of Dwarf Nova SW Ursae Majoris
Abstract
We report on the discovery of quasi-periodic oscillations (QPOs) with gigantic amplitudes of Delta m_V ~ 0.2 mag, which we call ``super-QPOs,'' in SW UMa during the early phase of the 1992 superoutburst. Superimposed on the superhumps and secondary humps with a period of 1.39 hr, individual QPO profiles are clearly resolved with a recurrence time of ~ 6.1 min in the light curve. The QPOs comprise of two components: a dip component with a typical duration of one minute, and a nearly sinusoidal component. We suggest that the dip component was likely to be caused by the eclipse of the central light source by a rotating blob or by a vertical inflation of the accretion disk with a horizontal dimension of 6 times 10(9) cm.
- Publication:
-
Publications of the Astronomical Society of Japan
- Pub Date:
- October 1992
- Bibcode:
- 1992PASJ...44L.215K
- Keywords:
-
- Accretion Disks;
- Dwarf Novae;
- Stellar Oscillations;
- Astronomical Photometry;
- Cataclysmic Variables;
- Power Spectra;
- Astrophysics;
- ACCRETION DISKS;
- QUASI-PERIODIC OSCILLATIONS;
- STARS: CATACLYSMIC;
- STARS: DWARF NOVAE;
- SW UMA