[vsnet-alert 1341] Possible superoutburst of CI UMa

[Taichi Kato <tkato>]

Possible superoutburst of CI UMa

   According to AAVSO News Flash No. 228, the SU UMa-type dwarf nova CI UMa
may be in superoutburst.

1997 Nov. 18.9917  14.1  (J. Bortle, from AAVSO News Flash 228)
          19.004   14.0  (J. Bortle, from AAVSO News Flash 228)
          20.0111  14.4  (J. Bortle, from AAVSO News Flash 228)

   The latest superoutburst of CI UMa occurred in 1997 July - August, when
the system reached mv=14.0 (Pietz and Hanson).  If the present outburst
is confirmed as another superoutburst, it will provide a strong support
to the short-supercycle nature of this dwarf nova, which has been claimed
by Nogami and Kato 1997, PASJ 49, 109).  The suggested short supercycle
length (110-140 d) is rather unusual for this short-period (Psh=0.0625 d)
system, making CI UMa one of the unique SU UMa-type dwarf novae.
Follow-up observations are highly encouraged.

Regards,
Taichi Kato

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