A normal and superoutburst study of the eclipsing SU UMa star: DV Ursae Majoris |
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| Authors: | Daisaku Nogami † Taichi Kato Hajime Baba Rudolf Novák J J Lockley M Somers |
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| Institution: | Universitäts-Sternwarte, Geismarlandstr. 11, D-37083 Göttingen, Germany;Department of Astronomy, Faculty of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan;Nicholas Copernicus Observatory, Kravíhora 2, Brno 616 00, Czech Republic;Department of Physics and Astronomy, the University of Southampton, Highfield, Southampton SO17 1BJ;Physics Department, Keele University, Keele, Staffordshire ST5 5BG |
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| Abstract: | We report on time-resolved photometry carried out during the 1995 short outburst and the 1997 long outburst in the eclipsing dwarf nova DV UMa. The revised orbital period is 0.0858526172 (67) d. We detected gigantic superhumps with an amplitude of ～0.6 mag in the mid-phase of the 1997 outburst, revealing the SU UMa nature of DV UMa. The superhump period is 0.0887 (4) d. The superhumps became less clear during the late phase of the superoutburst, and we found two possible periods of 0.0885 (15) and 0.0764 (15). During both outbursts, the eclipse was wide and shallow near the maximum, and then became narrower and deeper, which is qualitatively well explained by the current disc instability theory. |
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| Keywords: | accretion accretion discs eclipses stars: individual: DV UMa novae cataclysmic variables |
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