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Detection of Superhumps During the Outburst of BC UMA

Published online by Cambridge University Press:  14 August 2015

Chatief Kunjaya ,
Taichi Kato  and
Ryuko Hirata
Chatief Kunjaya
Affiliation:
Bosscha Observatory, Indonesia
Taichi Kato
Affiliation:
Kyoto University, Japan
Ryuko Hirata
Affiliation:
Kyoto University, Japan

Extract

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BC UMa was observed during its rare outburst in 1994. The superhumps with period 0.0619 day are clearly apparent, accompanied by secondary superhumps. This confirms the classification of BC UMa as an SU UMa type dwarf nova. The maximum brightness is 12.5 mag, which is about six magnitude brighterthan quiescence phase, and it makes BC UMa be classified as a TOAD (Tremendous Outburst Amplitude Dwarf-nova). The superoutburst’s magnitude was fainter than the preceeding normal outburst in September 1990. This faint superoutburst is uncommon among SU UMa stars and also among TOADs. The period analysis of the lightcurve taken after the end of the outburst yields the period of 0.0618 day which is shows that late superhumps is in operation.

Type
II. Joint Discussions
Information
Highlights of Astronomy , Volume 11 , Issue 1: Highlights of Astronomy. As presented at the XXIIIrd General Assembly of the IAU (Part A), 1997 , 1998 , pp. 388
Copyright
Copyright © Kluwer 1998