2006/02/08 by Yinghe Zhao, Zongyun Li, Xiaoan Wu +4 · 6 citations
Physics and Astronomy · #Accretion (finance) #Accretion disc #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Astrophysics and Star Formation Studies #Emission spectrum #Light curve #Photometry (optics) #Spectroscopy #astro-ph
paper · pdf · doi:10.1093/pasj/58.2.367
published in Publications of the Astronomical Society of Japan 58(2), 367-373 (Oxford University Press) · 16 pages, 10 figures, accepted for publication in PASJ
arxiv created 2006/02/08 · openalex publication_date 2006/04/25 · arxiv updated 2015/06/24 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Abstract We undertook a 4-day spectroscopic observation and conducted a 13-day photometric study of an SU UMa-type dwarf nova, ER Ursae Majoris. The mean K-amplitude for the emission lines is 54 ± 8 km s-1 and the γ velocity is 8 ± 4 km s-1 based on our spectroscopic results. A phase shift of 0.22 was 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 work should be done to explain the new phenomena.