Outburst of PV Per

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

CCD image by Iida

Outbursts in 1995 (from VSNET log)

1995 Sept. outburst

(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.

[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

1995 Oct. outburst

(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.

Taichi Kato & Ouda team

Rapid fading

(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.

Taichi Kato, Daisaku Nogami & Ouda team

Sonneberg data

(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

      - .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?
Taichi Kato

1996 Sep. superoutburst

The 1996 Sep. superoutburst

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