[vsnet-alert 5370] IX Dra: new ER UMa star?

[Taichi Kato <tkato>]

IX Dra: new ER UMa star?

   As reported by Tonny Vanmunster, IX Dra is now confirmed as an SU UMa
type dwarf nova.  As reported by Timo Kinnunen, the September outburst
lasted at least for four days, which might suggest another superoutburst.
If the September outburst was a genuine superoutburst, the interval of
subsequent superoutbursts becomes as short as 49 d, which is pretty close
to that of ER UMa!  Continued monitoring for future outbursts, as well as
deep monitoring for faint (normal) outbursts are strongly encouraged.
There are only four currently known (hydrogen-rich) ER UMa stars:
ER UMa, V1159 Ori, RZ LMi and DI UMa.

  YYYYMMDD(UT)   mag  observer
  20000913.830  <150  (T. Kinnunen)
  20000914.880   150  (T. Kinnunen)
  20000915.790   151  (T. Kinnunen)
  20000916.850   153  (T. Kinnunen)
  20000917.810   156  (T. Kinnunen)
  20000917.973  <150  (M. Reszelski)

  20001101.881  <153  (M. Reszelski)
  20001102.796   147  (M. Reszelski)
  20001103.717   149  (M. Reszelski)
  20001105.756   153: (M. Reszelski)

Regards,
Taichi Kato

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