CCD Photometry of a Newly Confirmed SU UMa-Type Dwarf Nova, NSV 4838

Akira Imada,Tatsuki Yasuda,Toshihiro Omodaka,Shota Oizumi,Hiroyuki Yamamoto,Shunsuke Tanada,Yoshihiro Arao,Kie Kodama,Miho Suzuki,Takeshi Matsuo,Hiroyuki Maehara,Taichi Kato,Kei Sugiyasu,Yuuki Moritani,Masanao Sumiyoshi,Kazuhiro Nakajima,Johen Pietz,Kenshi Yanagisawa,Daisaku Nogami

Publications of the Astronomical Society of Japan（2009）

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摘要

We present time-resolved CCD photometry of a dwarf nova, NSV 4838 (UMa 8, SDSS J102320.27+440509.8), during 2005 June and 2007 February outbursts. The two light curves showed superhumps with mean periods of 0.0699(1)d for the 2005 outburst and 0.069824(83)d for the 2007 outburst. Using its known orbital period of 0.0678 d, we estimated the mass ratio of the system to be $q$= 0.13 based on an empir...

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关键词

accretion, accretion disks,stars: dwarf novae,stars: individual (NSV 4838),novae, cataclysmic variables

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