Rare outburst of QY Per

According to J. Pietz ( vsnet-obs 4521), the dwarf nova QY Per is undergoing a rare outburst as indicated by the following observations.

1996 Dec. 07.88 UT  14.3   (J. Pietz)

The latest outburst occurred on 1995 Aug. 21 (T. Vanmunster).

The following information is from vsnet-obs 991 (1995 Aug. 24):

> Subject: [vsnet-obs 991] QY Per in 1994
> 
>    T. Vanmunster has kindly provided me a summary of the 1994 outburst of
> QY Per.
> 
> -- included message --
> 
> Here's the requested information on the 1994 outburst of QY Per, which
> I have taken over from CVC 21.
> 
> ------------------------------------------------------------------------
> DATE (UT)       MAGN  MS SEQ  OBSERVER        REMARKS        SOURCE
> ------------------------------------------------------------------------
> 1994 10 14.058 [14.5  mv GSC  Vanmunster, T.  35-cm refl.    VVS     
> 1994 10 25.889  14.0  mv GSC  Vanmunster, T.  35-cm refl.    VVS     
> 1994 10 25.917  14.1  mv GSC  Broens, E.      35-cm refl.    VVS     
> 1994 10 26.796  14.4  mv AA   Vanmunster, T.  35-cm refl.    VVS     
> 1994 10 26.842  14.3  mv GSC  Broens, E.      35-cm refl.    VVS
> 1994 10 26.928  14.4  mv GSC  Broens, E.      35-cm refl.    VVS
> 1994 10 26.88   14.2  mv GSC  Jensen, L.      33-cm refl.    Mail(jen)
> 1994 10 26.967  14.5  CU GSC  James, N.-Hurst, G.            TAEC897
> 1994 10 27.918  14.7: mv GSC  Vanmunster, T.  35-cm refl.    VVS     
> 1994 10 27.925 [13.9  mv AA   Broens, E.      35-cm refl.    VVS
> 1994 10 28.828 [14.5  mv GSC  Vanmunster, T.  35-cm refl.    VVS     
> 1994 10 29.041 [13.9  mv GSC  Broens, E.      35-cm refl.    VVS
> 1994 10 31.457 [16.0  CU      Iida, M.        ST6+16-cm refl Mail(kat)
> 1994 11 01.929 [14.8  mv TA   Vanmunster, T.  35-cm refl.    VVS
> 
> -- end of inclusion --
> 
>    Judging from this information, it seems to me that the 1994 outburst
> is a normal (short) outburst rather than a superoutburst as suggested
> in CVC 54.  It is rather surprizing that this outburst may have surpassed
> the brightest recorded outburst, but still seems to be a normal (short)
> one.  A similar cases can be found in BZ UMa, DV UMa etc.  I have vague
> impression that some TOADs behave unlike many TOADs, in that they rarely
> show superoutbursts in spite of their very low outburst frequency
> (this is just the opposite how WZ Sge-type dwarf novae usually behave).
> Can someone comment on this?  Or are we only missing superoutbrusts?
> I would be eager to know what has been the case of the 1995 outburst of
> QY Per.
> 
> Regards,
> Taichi Kato

The "true" QY Per is at 03h 15m 36s.82 +42o 28' 13".8 (J2000.0) as measured by N. James during the 1994 outburst. Note that the candidate in Downes and Shara (1993) is too far to the SE. The VSNET chart service (ftp/WWW) provides a chart corrected for this position.

VSNET chart (GSC mag, position corrected)

Look for what's happening, with your telescope defrosted for EG Cnc!

Regards,
Taichi Kato

Rapid fade

Return to HomePage

vsnet-adm@kusastro.kyoto-u.ac.jp