[vsnet-alert 2239] DM Dra rare? outburst

[Taichi Kato <tkato>]

DM Dra rare? outburst

   Timo Kinnunen reports a possible rare outburst of the poorly known dwarf
nova DM Dra.  Confirmatory observations, potential time-resolved CCD
photometry, accurate outburst astrometry are all important.  No previous
outburst had been reported to VSNET.

  YYMMDD(UT)   mag  observer
  980817.990  <156  (T. Kinnunen)
  980819.850  <156  (T. Kinnunen)
  980824.840  <156  (T. Kinnunen)
  980826.860  <156  (T. Kinnunen)
  980902.830  <156  (T. Kinnunen)
  980903.819  <156  (T. Kinnunen)
  980924.750  <156  (T. Kinnunen)
  980925.750   160: (T. Kinnunen)

   DM Dra was discovered by Stepanyan as SVS 2426.  The low resolution
spectrum taken during the outburst revealed the OB-type (consistent with
the dwarf nova classification).  Stepanyan reports the object is visible
on POSS at mag 20.  Magnitude reports by Stepanyan:

    JD        mpg
  2441119    <19.5
    43608    <19.5
    43613    <19.5
    43670    <19.5
    43965     15.5  spectroscopic observation done
    44054    <19.5
    44067    <19.5
    44071    <19.5
    44075    <19.5

  Quiescent CCD photometry by Howell et al. (PASP 102, 758) suggested the
presence of a 125-min period.  The object was V=20.8 at the time of this
observation.

Regards,
Taichi Kato

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