Superhump-like variation during the anomalous state of SU UMa

Details Superhump-like variation during the anomalous state of SU UMa Superhump-like variation during the anomalous state of SU UMa

2001-12-22

arxiv.org/abs/astro-ph/0112532v1

Astronomy and Astrophysics

Astrophysics

3 pages, 4 figures, accepted for publication in Astronomy and Astrophysics

Scientific paper

10.1051/0004-6361:20011827

We observed an anomalously outbursting state of SU UMa which occurred in 1992. Time-resolved photometry revealed the presence of signals with a period of 0.0832 +/- 0.0019 d, which is 3.6 sigma longer than the orbital period (0.07635 d) of this system. We attributed this signal to superhumps, based on its deviation from the orbital period and its characteristic profile. During this anomalous state of SU UMa, normal outbursts were almost suppressed, in spite of relatively regular occurrences of superoutbursts. We consider that an ensuing tidally unstable state following the preceding superoutburst can be a viable mechanism to effectively suppress normal outbursts, resulting in an anomalously outbursting state.

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