The 1996 Sep. superoutburst
PV Per, a suspected SU UMa-type dwarf nova, is undergoing a rather bright outburst as indicated by a CCD observation by Makoto Iida (vsnet-obs 2316).
CCD magnitude estimates by VSOLJ members object YYMMDD(UT) mag code PERPV 960310.446 159 Arm.VSOLJ Observer's code: Arm: M. Iida (Nagano, Japan) 20-cm refl. + ST-6 unfiltered
(from Cataclysmic Variables Circular No.58, T. Vanmunster, also in vsnet-obs 1156)
PV Per [UG, 14.9p - 20:p] =========================
Tonny Vanmunster, Landen, Belgium reports the detection of an outburst of PV Per. This little studied cataclysmic variable (UG-type) is part of the CVAP (Cataclysmic Variables Alert Programme) of the Belgian Astronomical Society. PV Per furthermore is listed as a possible TOAD [1]. Apart from this, we could trace no further information on the object. The position of PV Per, following [3], is :
R.A.= 02h42m53.57s, Decl.=+38d04'02.6" (J2000.0).
Eric Broens, Mol, Belgium has confirmed the outburst. The observations are :
1995 Sep 04.109 UT, [14.9 (T. Vanmunster, 0.35-m refl., seq: GSC);
Sep 15.881 UT, 14.5 (T. Vanmunster);
Sep 15.886 UT, 14.7: (E. Broens, 0.35-m refl., seq: GSC);
Sep 15.875 UT, 14.6 (T. Vanmunster);
According to the 'Outburst Activity Database' [2], PV Per was once recorded in outburst before, by T. Kato on October 20, 1990 at mag. 15.9V.
References ---------- [1] Howell, Skody, Cannizzo, 1995, ApJ, 439, 337. [2] Vanmunster, Howell, 1995, to be published. [3] Downes, Shara, 1993, PASP, 105, 127-245.
Tonny Vanmunster
(vsnet-obs 1325)
CCD magnitude estimates by VSOLJ members object YYMMDD(UT) mag code PERPU 951013.549 176 Arm.VSOLJ PERPV 951013.545 172 Arm.VSOLJ Observer's code: Arm: M. Iida (Nagano, Japan) 20-cm refl + ST-6 unfiltered
(vsnet-obs 1336, T. Kato)
CCD observations by Iida and the Ouda team have confirmed that both dwarf novae have rapidly faded from outbursts. PU Per, especially, has probably gone below 18-th mag. We have to make a correction to the magnitude of PU Per reported last night; the magnitude should be V=16.5.
Regards,
Taichi Kato & Ouda team
(vsnet-obs 1339)
PV Per has faded quite rapidly as the following observations indicates.
mid-UT V-C S.D. N band V-mag
--------------------------------- -----
951013.771 2.870 0.054 2 V 17.0
951014.631 4.756 0.000 1 V 18.9:
comparison star: 02h42m54s.77 +38o04'08".5 (J2000.0)
GSC V=14.2 (14.15 in revised VSNET chart)
The rate of decline also suggests that this dwarf nova is a ultrashort orbital period system. From this point of view, Sep. 15 outburst detected by T. Vanmunster might be a superoutburst.
Further close monitoring would be recommended. One should again remember that the present short outburst may trigger a superoutburst. Please continue a close watch.
Regards,
Taichi Kato, Daisaku Nogami & Ouda team
(vsnet-obs 1460)
We have found one more literature on PU Per and PV Per (Busch, H., Haeussler, K., 1979, VSS 9, 125). Following outbursts were observed from Sonneberg plate collection. My comments are added based on recent classification of these stars as probable SU UMa-type dwarf novae.
PU Per
------
JD mag comment
2439051.34 [16.0
9052.36 15.5 superoutburst
9053.44 16.0
9056.48 16.0
9380.56 16.0
9385.52 14.7 superoutburst lasting at least 10 days
9386.53 14.7
9388.49 15.0
9390.61 15.5
2441300.23
- .49 15.6-15.7 (five plates) = identical with the second outburst
1304.38 [16.0 by Romano, Minello (1976)
= superoutburst
From these data, one may conclude:
1) The shortest recorded interval between superoutbursts is ~330 day.
2) Normal outbursts seem to be rare. Some may be missed due to their
faintness, though.
PV Per
------
Rather numerous outbursts were recorded. Only the dates of maxima
are cited here.
JD mag comment
2439003 16.2 single plate
9027-9029 rose from 17.0 to 15.5
9146 16.1 single plate
9379-9391 14.9 definitely a superoutburst; declined to 16.1 on
9390, followed by 1 mag decline in one day
9441 16.1: single plate
2440173 15.2 three plates
0205 16.4-16.7 four plates
0477-0485 15.2: probably a superoutbust
0531 14.9: two plates
1244-1249 rose from 16.7 to 15.0, superoutburst
1350-1351 faded from 15.0 to 15.6
1989 15.1 two plates
2359-67 15.3-16.8 gap in observations, superoutburst?
Regrads,
The 1996 Sep. superoutburst
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