[vsnet-campaign 912] AL Com early superhumps and decline

[Taichi Kato <tkato>]

AL Com early superhumps and decline

Dear Colleagues,

   More analysis (still ongoing) of the May 19 data has revealed the
rapid fading at a rate of 0.80 mag/d.  Early superhumps are present, as
already reported.  The best period from the presently available data
is very slightly shorter than the orbital period, but the difference
is marginally within errors of respective measurements.  This observation
may be the first indication of "negative superhumps" in the earliest
stage of WZ Sge-type superoutburst.  The full amplitude of early superhumps
is 0.04-0.05 mag, and humps are singly peaked.  This makes striking
contrast to early superhumps observed in the 1995 superoutburst.
This may be an indicatation that we are witnessing the earlier stage
of evolution of these humps than in 1995.  More detailed analysis
will be later presented by Ishioka-san et al.  Intensive observations
are very encouraged.

Regards,
Taichi Kato
VSNET Collaboration team

VSNET Home Page

---

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

VSNET Home Page

Return to Daisaku Nogami

---

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