[vsnet-alert 6285] WZ Sge superhump period

[Taichi Kato <tkato>]

WZ Sge superhump period

Dear Colleagues,

   The most recent estimate of the superhump period better agrees that
of Bohusz and Udalski 1979 (IBVS 1979), P=0.057213, than that of Patterson
et al. 1981 (ApJ 248, 1067), P=0.05714, obtained on the occassion of
the 1978 superoutburst.

   We have more closely examined these original data.  The cycle counts
in Bohusz and Udalski 1979 have been found to be correct (to the present
knowledge of the new superhump period), while there seem to be ambiguities
in superhump identifications in Patterson et al. 1981.  We have securely
identified three superhump timings on Dec. 22-25, and probable one on
Dec. 28.  Three possible superhump timings on Dec. 19 and 26 do not match
the currently determined period, and the ephemeris by Bohusz and Udalski
1979.  It is very likely the period of 0.05714 d was strongly affected
by these "noisy" identifications.  Using new secure identifications of
superhump times, from Bohusz and Udalski 1979 and Patterson et al. 1981,
we obtained a refined superhump period of 0.05722 d for the 1978
superoutburst.  This superhump period is 1.0% longer than the orbital
period.

Regards,
Taichi Kato
VSNET Collaboration team

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