[vsnet-campaign-dn 1419] HO Del observation at Nyrola: genuine superoutburst!

[Taichi Kato <tkato>]

HO Del observation at Nyrola: genuine superoutburst!

Dear Colleagues,

   Marko Moilanen (Nyrola observatory, Finland) has just informed that
clear superhumps are detected.  The description follows:

Here is the dataset and lightcurve of HO Del from last night. About 0.3 mag 
(super?)humps are easy detected. I made also a quick PDM analysis with 
"period" -program. Best period estimate from this short dataset is 0.063262, 
which is little longer than reported orbital period.

Please look also the lightcurve in address:
http://vsnet.ursa.fi/sirius/nytt/ccd/hodel28082001.jpg

Regards,

Marko Moilanen
marko.moilanen@jklsirius.fi

Astronomical Assocition Sirius ry, Finland
http://vsnet.ursa.fi/sirius/siriuseng.html

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   The light curve suggests that the superhumps were just growing, toward
its maximum amplitude.  The present outburst is thus confirmed to be
a genuine superoutburst.  During the past superoutburst (was there any
known normal outburst for this star?), superhumps once decayed and grew
again, as was observed in V1028 Cyg.  Perhaps HO Del is another example
of short-period variety of SU UMa-type dwarf novae, which frequently
show post-superoutburst rebrightening(s) or positive derivative of the
superhump periods.  Continuous time resolve photometry is encouraged,
if you have a back-up telescope + CCD in addition to the one observing
WZ Sge.

Regards,
Taichi Kato
VSNET Collaboration team

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