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Observation of the WZ Sge-Type Dwarf Nova AL Com

Published online by Cambridge University Press:  12 April 2016

T. Kato ,
D. Nogami ,
H. Baba ,
K. Matsumoto ,
J. Arimoto ,
K. Tanabe  and
K. Ishikawa
T. Kato
Affiliation:
Department of Astronomy, Kyoto University, Sakyo-ku, Kyoto 606-01, Japan
D. Nogami
Affiliation:
Department of Astronomy, Kyoto University, Sakyo-ku, Kyoto 606-01, Japan
H. Baba
Affiliation:
Department of Astronomy, Kyoto University, Sakyo-ku, Kyoto 606-01, Japan
K. Matsumoto
Affiliation:
Astronomical Institute, Osaka Kyoiku University, Asahigaoka, Kashiwara, Osaka 582, Japan
J. Arimoto
Affiliation:
Astronomical Institute, Osaka Kyoiku University, Asahigaoka, Kashiwara, Osaka 582, Japan
K. Tanabe
Affiliation:
Astronomical Institute, Osaka Kyoiku University, Asahigaoka, Kashiwara, Osaka 582, Japan
K. Ishikawa
Affiliation:
Astronomical Institute, Osaka Kyoiku University, Asahigaoka, Kashiwara, Osaka 582, Japan

Abstract

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Although presently classified as a SU UMa-type dwarf nova, WZ Sge is well known as one of the most peculiar objects in that it shows only superoutbursts with exceptional duration and amplitude, and no normal outbursts. Furthermore, on its decline from the 1978 outburst, WZ Sge showed a deep temporal dip. All of these characteristics have puzzled both theoreticians and observers.

The dwarf nova AL Com was photometrically observed during the outburst in 1995 April, which occurred for the first time since 1975. The striking similarity of AL Com to WZ Sge, as demonstrated by the present observation (Fig. 1), provides plenty of material in interpreting the enigmatic nature of WZ Sge-type dwarf novae.

Type
Non-Magnetic Cataclysmic Variables
Information
International Astronomical Union Colloquium , Volume 158: Cataclysmic Variables and Related Objects , 1996 , pp. 77 - 78
Copyright
Copyright © Kluwer 1996