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Fraser Farrell wrote ( vsnet-obs 4520):
> Our complete observations of the peculiar superoutburst of WX Hyi during > October-November. After looking at the lightcurve with VSSPlot 2.0b I'm > beginning to wonder if this star is trying to become a UGZ, or just > redefining the meaning of UGSS ! > > > November observations > WX HYI 2450391.9396 <13.7 Tz > WX HYI 2450393.9368 12.4 Tz > WX HYI 2450393.9569 12.4 Tz > WX HYI 2450394.9924 13.0 MKA > WX HYI 2450400.9535 <12.5 MKA > WX HYI 2450405.9444 12.8 MKA > WX HYI 2450410.0465 13.0 Tz > WX HYI 2450413.9444 <13.0 Tz > > October observations (previously reported) > WX HYI 2450359.9382 <13.7 Tz > WX HYI 2450363.0535 12.0 Tz > WX HYI 2450363.9326 11.3 Tz > WX HYI 2450364.0014 11.7 MKA > WX HYI 2450365.9264 11.1 Tz > WX HYI 2450366.9201 11.8 MKA > WX HYI 2450369.0576 12.0 MKA > WX HYI 2450369.9625 11.3 Tz > WX HYI 2450370.0104 12.0 MKA > WX HYI 2450370.9514 11.7 Tz > WX HYI 2450373.0160 12.4 MKA > WX HYI 2450373.9521 12.4 Tz > WX HYI 2450376.9500 <13.7 Tz > WX HYI 2450377.9708 <12.6 MKA > WX HYI 2450379.9646 12.5 Tz > WX HYI 2450386.9417 12.4 Tz > WX HYI 2450386.9514 12.3 Tz > WX HYI 2450386.9632 12.5 Tz > WX HYI 2450386.9722 12.2 Tz > WX HYI 2450386.9819 12.2 Tz > WX HYI 2450386.9868 12.5 Tz > WX HYI 2450386.9910 12.5 Tz > > MKA = Michael Mattiazzo, 20cm Newtonian (light-polluted site) > Tz = Justin Tilbrook, 20cm Newtonian
SU UMa-type dwarf novae tend to redefine themselves in the northern hemisphere. We know four well-observed members of a peculiar group of ever-erupting (Z Cam-like) SU UMa-type dwarf novae called ER UMa stars or RZ LMi stars. The group presently consists of ER UMa, V1159 Ori, RZ LMi and DI UMa. They all show extremely short outburst cycle lengths of 3-4 days, recurrence time of superoutbursts of 19-44 days. Is WX Hyi wishing to join this group?
References:
Discovery and observations of ER UMa stars or RZ LMi stars:
Kato T., Kunjaya C. 1995, PASJ 47, 163
Robertson J. W., Honeycutt R. K., Turner G. W. 1995, PASP 107, 443
Misselt K. A., Shafter A. W. 1995, AJ 109, 1757
Nogami D., Kato T., Masuda S., Hirata R. 1995a, IBVS No.4155
Nogami D., Kato T., Masuda S., Hirata R., Matsumoto K., Tanabe K.,
Yokoo T. 1995b, PASJ 47, 897
Patterson J., Jablonski F. Coen C., O'Donoghue D., Skillman D. R.
1995, PASP 107, 1183
Warner B. 1995, ApSS, 226, 187 (review on SU UMa stars)
Theory:
Osaki Y. 1995a, PASJ 47, L11
Osaki Y. 1995b, PASJ 47, L25
Osaki Y. 1996, PASP 108, 39 (review on dwarf nova outbursts)
Regards,
Taichi Kato
