Unusual Phase Reversal of Superhumps in ER Ursae Majoris
Abstract
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.
- Publication:
-
Publications of the Astronomical Society of Japan
- Pub Date:
- April 2003
- DOI:
- 10.1093/pasj/55.2.L7
- arXiv:
- arXiv:astro-ph/0211520
- Bibcode:
- 2003PASJ...55L...7K
- Keywords:
-
- accretion;
- accretion disks;
- stars: dwarf novae;
- stars: individual (ER Ursae Majoris);
- stars: novae;
- cataclysmic variables;
- stars: oscillations;
- Astrophysics
- E-Print:
- 4 pages, 5 figures, submitted to Publ. Astron. Soc. Japan