The 2000-2001 superoutburst of the WZ Sge-type star RZ leonis: A clue to understanding the origin of viscosity in quiescent dwarf nova disks

Ishioka, R; Kato, T; Uemura, M.; Iwamatsu, H; Matsumoto K.; Stubbings R.; Mennickent, R.; Billings, GW; Kiyoto, S; Masi G.; Pietz, J; Novak R.; Martin, BE; Oksanen A.; Moilanen, M; et. al.

Abstract

We report here on time-resolved photometric observations of the superoutburst of a dwarf nova, RZ Leo, which occurred during 2000 December-2001 January. We reveal the following characteristics of the outburst based on our observations: long duration, large amplitude, and the existence of two types of superhumps - "early superhumps" and "normal superhumps". In addition to the extremely low frequency of the outbursts, the characteristics of the outburst strongly indicate that RZ Leo is the fifth member of the WZ Sge-type dwarf novae. The orbital period of RZ Leo is 0.07651 d, which is remarkably longer than the "canonical" period of other WZ Sge stars (? 0.058 d). The longer period indicates a non-degenerate secondary of RZ Leo, which suggests that the idea of a low quiescence viscosity due to a degenerate brown dwarf secondary may not be correct. The present discovery of RZ Leo as being a WZ Sge star provides the first clear indication that the decay of magnetic turbulence in accretion disks of quiescent WZ Sge stars plays an important role in producing the proposed low quiescent viscosity.

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Título según WOS: The 2000-2001 superoutburst of the WZ Sge-type star RZ leonis: A clue to understanding the origin of viscosity in quiescent dwarf nova disks
Título según SCOPUS: The 2000-2001 superoutburst of the WZ Sge-type star RZ Leonis: A clue to understanding the origin of viscosity in quiescent dwarf nova disks
Título de la Revista: PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
Volumen: 53
Número: 5
Editorial: OXFORD UNIV PRESS
Fecha de publicación: 2001
Página de inicio: 905
Página final: 913
Idioma: English
Notas: ISI, SCOPUS