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GALEX J194419.33+491257.0: An unusually active SU UMa-type dwarf nova with a very short orbital period in the Kepler data
Kato, Taichi; Osaki, Yoji
AA(Department of Astronomy, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502 ), AB(Department of Astronomy, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033)
Publications of the Astronomical Society of Japan, Volume 66, Issue 2, id.L5 (OUP Homepage)
Publication Date:
Astronomy Keywords:
accretion, accretion disks, novae, cataclysmic variables, stars: dwarf novae, stars: individual (GALEX J194419.33+491257.0)
Abstract Copyright:
The Author 2014. Published by Oxford University Press on behalf of the Astronomical Society of Japan. All rights reserved.
Bibliographic Code:


We studied a background dwarf nova of KIC 11412044 in the Kepler public data and identified it with GALEX J194419.33+491257.0. This object turned out to be a very active SU UMa-type dwarf nova that has a mean supercycle of ˜ 150 d and frequent normal outbursts with intervals of 4-10 d. The object showed a strong persistent signal of the orbital variation with a period of 0.0528164(4) d (76.06 min) and superhumps with a typical period of 0.0548 d during its superoutbursts. Most of the superoutbursts were accompanied by a precursor outburst. All these features are unusual for this very short orbital period. We succeeded in detecting an evolving stage of superhumps (stage A superhumps) and obtained a mass ratio of 0.141(2), which is unusually high for this orbital period. We suggest that the unusual outburst properties are a result of this high mass ratio. We suspect that this object is a member of the recently recognized class of cataclysmic variables (CVs) with a stripped core evolved secondary which are evolving toward AM CVn-type CVs. The present determination of the mass ratio by using stage A superhumps is the first case in such systems.
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