Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-11-22
Astronomy and Astrophysics
Astrophysics
4 pages, 4 figures, A&A macro in latex format, accepted to A&A letters
Scientific paper
10.1051/0004-6361:20011644
We report on time-series photometric observations in the earliest stages of superoutbursts of the extreme dwarf novae, AL Com and WZ Sge, which started on 2001 May after the 6 years quiescence and on 2001 July after the 23 years quiescence, respectively. We detected growth of ``early superhumps'' during the each rising stage. Our observations reject the mass transfer instability for the trigger of the superoutburst of WZ Sge stars, and show the existence of some relations between the ``early superhumps'' and the spiral structure, which give a hint of the origin of the ``early superhumps.''
Cook Lew
Ishioka Ryoko
Kato Taichi
Kiyota Seiichiro
Martin Brian
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