[vsnet-alert 6151] WZ Sge period analysis

[Taichi Kato <tkato>]

WZ Sge period analysis

Dear Colleagues,

   Gianluca Masi has provided the complete data set on July 28.  The PDM
analysis gives a period of 0.05758 +/- 0.00014 d, which is longer than the
previous value, as Masi has pointed out.  While this may be an indication
of emerging "true" superhumps, observers be careful since the very first
run of early superhumps also gave a longer period.  A combined analysis
with the partially analyzed Kyoto data on July 28 seems to confirm the
period change (or instability), but the tendency needs to be confirmed
by a longer baseline observation.  It may be also that early superhumps
occasionally show different periods (or the period analysis more reflects
the temporary change in profile), or it may be also that true superhumps
may be emerging.  The overall fading trend has not changed siginificantly,
unlike "jumps" or "kinks" in other recent WZ Sge-type dwarf novae when they
start showing true superhumps.  Only further observations can tell the truth!
Please continue the present excellent coverage!

Regards,
Taichi Kato
VSNET Collaboration team

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