[vsnet-alert 5508] RZ Leo: unusual superhump Pdot

[Taichi Kato <tkato>]

RZ Leo: unusual superhump Pdot

Dear Colleagues,

   As reported by Ishioka-san,

Subject: [vsnet-campaign-dn 379] RZ Leo observation at Kyoto

>   From the data set combined with all collaborators time series data,  
> the superhump period from Dec. 24 is 0.07854 d and almost constant. 

   One of the most remarkable thing in the RZ Leo (true) superhumps is
the almost constant superhump period.  Most of (usual) SU UMa-type
dwarf novae at this orbital periods show "textbook" period decrease at
Pdot/P = -(a few)*10^(-5).  Only few exceptions have been observed
in, ultrashort-period, most infrequently outbursting objects.
Some authors have attibuited to such negligibly small period decrease
to the small tidal torque by the extremely light secondary (as in WZ Sge),
but the RZ Leo is not clearly such a case!  We have learned and will
learn much from RZ Leo about the mystery of WZ Sge-type stars.
Now, your contribution is most wanted at this and coming important stages
of superoutburst!

Regards,
VSNET Collaboration team

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