[vsnet-alert 5208] Outburst of S10943 Vul = RX J1953.1+2115

["Tonny Vanmunster" <Tonny.Vanmunster@advalvas.be>]

Dear colleagues,

We have detected an outburst of S10943 Vul = RX J1953.1+2115, a ROSAT dwarf nova of possible UGSU type, using the 0.35-m f/6.3 telescope and unfiltered CCD at CBA Belgium Observatory. Details :

20000825.899 UT, 15.1 C 

S10943 Vul is discussed in IBVS 4622 (Richter et al.), in which they present an outburst analysis using archival plates at Sonneberg Observatory. They found a recurrence time of 83.6 days, with both short and long outbursts. They also found small amplitude fluctuations (about 0.2 mag), which they interpret as superhumps (hence, the expected UGSU classification). The superhump period is still unsure, with values of 0.1196 d, or 0.136 d, or 0.107 d. Remark that this is at the upper border of the period gap. There's only one UGSU dwarf nova with a longer superhump period (TU Men). 

S10943 is located at RA = 19h53m05s.0, Decl. = +21°14'49" (equinox J2000).

We have started a time-series photometry session on this object, in an attempt to more accurately determine the superhump period (assuming we're observing a superoutburst). Any help from other longitudes would be appreciated, given the expected high superhump period value. Right now, we are viewing the real-time development of the time-series light curve. A first indication of a periodic modulation seems to become evident.

With kind regards,
Tonny Vanmunster
CBA Belgium Observatory

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