[vsnet-alert 112] detection of "early superhumps" in AL Com

[tkato@kusastro.kyoto-u.ac.jp]

AL COMAE BERENICES

  Time-resolved V-band CCD photometry of AL Com with the 0.60-m reflector
at Ouda Station, Kyoto University, on Apr. 7.487-7.801 UT clearly shows
the existense of double-humped brightness modulation which can be inter-
preted as "early superhumps" observed in WZ Sge-type dwarf novae (cf.
HV Vir, Kato and Sekine, PASJ submitted).  The best estimate of the period
and the amplitude are 0.0569 +/- 0.0001 day and 0.07 mag, respectively.
By analogy with WZ Sge and HV Vir, this period may reflect the orbital
period of this system; we may expect "true" superhumps with a period a few
percent longer than this will grow in a week or so.  Further observations
are strongly encouraged.

Taichi Kato
Department of Astronomy,
Kyoto University

VSNET Home Page

Return to Daisaku Nogami

---

vsnet-adm@kusastro.kyoto-u.ac.jp