[vsnet-alert 154] Re: BC UMa

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

Concerning Dr. Howell's comment:

   It would be interesting to note that the individual superhump period
determination during the April 1994 superoutburst ranged between 0.0619
- 0.0629 day (Iida, Kunjaya; the latter period was based on observations
with better statistics), which seems to "agree" with the photometrically
determined orbital period (91.2 +/- 2 min) by Howell et al., but possibly
not longer as is expected for a superhump period (!).

   A similar case seems to have been best established in AL Com, which
shows two different periodicities during quiescence: one which can be
attributed to 1/2 Porb, the other longer than the superhump period.
Clearly we must learn more about the nature of quiescent light variation
in these low Mdot SU UMa systems.

Regards,
Taichi Kato
Kyoto University

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