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[vsnet-campaign-dn 3402] BC UMa: early superhumps?

BC UMa: early superhumps?

Dear Colleagues,

   We have received a complete set of data from Maehara-san.  An analysis
of the combined data on Feb. 1 reported up to now is consistent with the
presence of low-amplitude double-wave modulations with a period close to
the orbital period (the best period from the Feb. 1 data is around 0.062 d).
This feature resembles those of "early superhumps" in WZ Sge-type dwarf
novae (see Kato (2002) PASJ 54, L11; also see
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/DNe/wzsge01.html for the
representative WZ Sge light curves).

   If the current outburst indeed evolves into a genuine superoutburst,
the present observation seems to illustrate a supposed link between
WZ Sge-type stars and BC UMa (see Kato et al. (2001) PASJ 53, 1191
for more discussion).

   Phase-averaged light curve on Feb. 1:

   http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/DNe/BC_UMa/bc1ph.gif

Regards,
Taichi Kato
VSNET Collaboration team

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