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SY Cir: mystery, dwarf nova? This is the message (vsnet-campaign 275) I posted on 2000 July 1. > SY Cir: long-term campaign target > > I would like to propose the following object as a long-term campaign > object. > > During the ROSAT identification, I have noticed the following object. > The identification is not secure. Since several RV Tau candidates later > turned out to be CVs, this object would deserve further dense observations. > > I would like to propose the following object as a long-term campaign > object. > > During the ROSAT identification, I have noticed the following object. > The identification is not secure. Since several RV Tau candidates later > turned out to be CVs, this object would deserve further dense observations. > > SY Cir: > > 140344.9 -693731 (2000.0) CIRSY * RV 12.2 15.0 P 25328.0 46.36 - R1/CIR > GSC9248.841 140344.95 -693731.1 (2000.0) 12.28 6 > USNO0150.12788937 140344.842 -693731.95 (2000.0) 11.6 13.7 > > ROSAT: > > 140347.4 -693735 (2000.0) 1RXS-F_J140347.4-693736 0.014 1.00 0.18 The ASAS-3 data seem to confirm this finding. The data show that the object is likely a dwarf nova with a period of 10-20 d. The object looks similar to CN Ori or other short-period SS Cyg stars. However, the VSNET reports have not yet detected any outburst. Since most of the recorded outburst by ASAS-3 reach V=11.5, they must have been well above visual detection limits. The star may have been mislabeled on some chart for visual observation (?). Regards, Taichi Kato
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