Unusual Phase Reversal of Superhumps in ER Ursae Majoris

Details Unusual Phase Reversal of Superhumps in ER Ursae Majoris Unusual Phase Reversal of Superhumps in ER Ursae Majoris

2002-11-24

arxiv.org/abs/astro-ph/0211520v1

Astronomy and Astrophysics

Astrophysics

4 pages, 5 figures, submitted to Publ. Astron. Soc. Japan

Scientific paper

We studied the evolution of superhumps in the peculiar SU UMa-type dwarf nova, ER UMa. Contrary to the canonical picture of the SU UMa-type superhump phenomena, the superhumps of ER UMa show an unexpected phase reversal during the very early stage (~5 d after the superoutburst maximum). We interpret that a sudden switch to so-called late superhumps occurs during the very early stage of a superoutburst. What had been believed to be (ordinary) superhumps during the superoutburst plateau of ER UMa were actually late superhumps. The implication of this discovery is briefly discussed.

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