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[vsnet-obs 3769] on V1363 Cyg

V1363 Cyg (=VV 279)

Tonny Vanmunster wrote in vsnet-obs #3765:

> V1363 Cyg is not visible on earlier CCD images, obtained at the CBA Belgium, 
> although they have a similar limiting magnitude. This further proves the
> reality of the object.
>
> The Outburst Activity Database on Selected Cataclysmic Variables contains no
> entries on past outbursts of this object.

    According to the discovery paper (Ric. Astr. Vol. 8, No. 10), V1363 Cyg
showed very peculiar behavior unlike other dwarf novae.

       JD       magnitude
     (+2400000)
 ----------------------------------------------------------------------
  around 32400: fainter than 17.5
  around 32600: observed at 13-14 for about 40 days
                then faded again to 16-<17.5
         32950: started to brighten slowly
         33000-33200: 14-15 mag
                then slowly faded to mag 17 around 33600
         33980: started to brighten, reaching a maxium of 13.5 around
                34000
         34100: 15-16 mag
         34150: 13.5, then faded to
  around 34200: 14-14.5
         34220: faded further to mag 16
         34230: brightened again to mag 14
                then faded very slowly to mag 18 around 35000

    From the time-scale of variations, the object looks like an anti-dwarf
nova (like MV Lyr and KR Aur) rather than usual Z Cam stars.  Spectroscopic
observation by Bruch and Schimpke 1992 (A&AS 93, 419) confirmed its
cataclysmic nature.  Recent faint state of this object is remniscent of
the "superminimum" of MV Lyr.  The ROSAT Bright Source J2006.2+2342 may be
identified with this CV.  Close follow-up observations are urged to see
if the star may become active again.

Regards,
Taichi Kato