Large-Amplitude Modulations of the Cataclysmic Star ER UMa
Abstract
We present our BR observations of the cataclysmic star ER UMa covering three consecutive light cycles at quiescence. Their light curves are asymmetric with steeper decreasing branch. While the large light amplitudes of the first two cycles may be expected for the quiescent state, the 0.9^{m} amplitude of the third cycle is unusual big. The period of the observed light modulations in 2008 is shorter than the orbital one. Thus our observations leaded to a discovery of large-amplitude negative superhumps at quiescent state of ER UMa.
- Publication:
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Publications de l'Observatoire Astronomique de Beograd
- Pub Date:
- September 2010
- Bibcode:
- 2010POBeo..90..147K