Superhumps Behavior during Normal Outbursts in ER UMa: Spectroscopy and Photometry

Details Superhumps Behavior during Normal Outbursts in ER UMa: Spectroscopy and Photometry Superhumps Behavior during Normal Outbursts in ER UMa: Spectroscopy and Photometry

2006-02-08

arxiv.org/abs/astro-ph/0602181v1

Publ.Astron.Soc.Jap. 58 (2006) 367-373

Astronomy and Astrophysics

Astrophysics

16 pages, 10 figures, accepted for publication in PASJ

Scientific paper

We have taken a 4-day spectroscopic observation and have been conducting a 13-day photometric study of the SU UMa-type dwarf nova, ER Ursae Majoris. The mean $K$-amplitude for the emission lines is $54\pm 8$ km s$^{-1}$ and $\gamma$ velocity is 8$\pm 4$ km s$^{-1}$ from our spectroscopic results. A phase shift of 0.22 is also obtained. Our photometric observation confirms superhumps in normal outbursts of ER UMa and reconciles contradictory observational results obtained by different authors. We find that superhumps possibly develop near each normal outburst maximum and fade out before the next outburst maximum. If the observed humps were not late superhumps but ordinary superhumps, much more theoretical works should be done to explain the new phenomena.

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