(Outburst CCD image by Peter Nelson: click to see the wide-field image)
(Outburst CCD image by Berto Monard: click to see the wide-field image)
(Outburst CCD image by Roland Santallo)
RX Vol appears to be in outburst.
VOLRX 030504.388 147 Stu.RASNZ VOLRX 030504.442 147 Stu.RASNZ Regards, Rod Stubbings
RX Vol is registered as UGSU: in GCVS (maximum 16p). The present likely outburst absolutely need further investigation. Time-resolved photometry is urgently encouraged (after confirmation of the outburst, naturally).
The catalog position is 08:39:32.30 -66:17:39.2 (J2000.0). We would be happy to receive representative images (in FITS) for accurate astrometry, as usual.
RX Vol outburst is the first one recorded that I know of.
Regards, Rod Stubbings(vsnet-alert 7729)
Dear colleagues,
The first outburst since the discovery of RX Vol was reported to VSNET. Follow-up obsevations are encouraged! The only one reference (Munari & Zwitter 1998, A&AS, 128, 277) picked by the ADS except for the DS catalog gives a quiescence V magnitude below 22 (the amplitude over 7 mag!?), while the finding chart given in the Downes catalog living edition show a faint object.
Best regards, Daisaku Nogami
RX Vol astrometry by Peter Nelson
Peter Nelson's measurement:
Using GSC-ACT I get the following astrometry: 08 39 32.39 -66 17 39 84 stars used, average residual 0.35 arc" ===The FITS image is also being examined by Yamaoka-san for accurate astrometry and quiescent identification.
Regards, Taichi Kato
RX Vol: likely emerging superhumps!
Peter Nelson provided a 2.7-hour time-series photometry. The data show 0.1 mag modulations, which are probably emerging superhumps. The present period is about 0.06 d, suggesting that RX Vol belongs to a short-period SU UMa-type dwarf nova (as represented by WZ Sge-type stars). The fully developed superhumps may have different periods, as we have seen in V1028 Cyg. We strongly encourage further continuous observations!
We will soon put information on the VSNET website.
Regards, Taichi Kato VSNET Collaboration team
RX Vol: definite SU UMa-type dwarf nova with fully grown superhumps!
Dear Colleagues,
We have received further data from Roland Santallo and Peter Nelson. As Peter Nelson reported in [vsnet-outburst 5502], the star now exhibits decisive superhumps with a mean amplitude of 0.22 mag.
The period determined from the May 5 data is 0.0613(2) d, which confirms the earlier suggestion that RX Vol belongs to short-period SU UMa stars. The earlier emergence of a seemingly slightly shorter period may represent a variety of "early superhumps", which was suspected in T Leo with Psh = 0.0602 d (Kato 1997, PASJ 49, 583). Please note that EG Cnc (WZ Sge-type star) also has a similar period (Psh = 0.06038 d). Combined with the presumably large outburst amplitude, RX Vol is expected to show some sort of similar activities (Psh increase, rebrightening etc.) as seen in WZ Sge stars. Further continued observations are very strongly encouraged!!
Regards, Taichi Kato VSNET Collaboration team
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