Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasj...44l.215k&link_type=abstract
PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 44, no. 5, p. L215-L219.
Astronomy and Astrophysics
Astronomy
24
Accretion Disks, Dwarf Novae, Stellar Oscillations, Astronomical Photometry, Cataclysmic Variables, Power Spectra
Scientific paper
We report on the discovery of quasi-periodic oscillations (QPOs) with gigantic amplitudes of Delta m(V) about 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 recurrence time of about 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 x 10 exp 9 cm.
Hirata Ryuko
Kato Taichi
Mineshige Shin
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