[vsnet-alert 1226] Brightening of QW Sge

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

Brightening of QW Sge

  M. Moriyama (Nagasaki, Japan) has pointed out that the symbiotic variable
QW Sge (=AS 360) has brightened significantly in these ~20 days.  His magnitude
estimates have been confirmed by T. Watanabe (Shizuoka, Japan).  While it is
not still certain whether this brightening may lead to a major outburst,
follow-up observations, in particular spectroscopy and multicolor photometry,
are strongly recommended.

  Recent observations reported to VSNET are given below.  Note Moriyama and
Watanabe have used the GSC sequence, which appears to conincide to 0.1 - 0.2
mag with the VSNET V-mag and the Tycho scales.  G. Poyner has reported to
use another sequence, which apparently gives about 0.3 mag systemtically
brighter magnitudes, but his observations also seem to confirm the brightening
trend.

  The VSNET QW Sge page is located at

  http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Symbio/qwsge.html

which include the VSNET V-mag chart and a CCD image.

  YYMMDD(UT)   mag  observer
  970726.037   119  (G. Poyner)
  970727.924   118  (J. S. Day)
  970728.082   119  (G. Poyner)
  970729.007   118  (G. Poyner)
  970801.988   117  (G. Poyner)
  970802.742   124  (T. Watanabe)
  970807.688   123  (M. Moriyama)
  970807.921   118  (J. S. Day)
  970808.026   118  (G. Poyner)
  970808.915   118  (J. S. Day)
  970809.897   118  (J. S. Day)
  970809.969   119  (G. Poyner)
  970812.019   118  (G. Poyner)
  970813.885   117  (D. Gill)
  970813.963   119  (G. Poyner)
  970814.933   117  (D. Gill)
  970814.974   118  (G. Poyner)
  970816.001   119  (G. Poyner)
  970826.033   117  (G. Poyner)
  970826.608   120  (M. Moriyama)
  970827.960   113  (G. Poyner)
  970901.626   118  (M. Moriyama)
  970901.982   113  (G. Poyner)
  970904.012   113  (G. Poyner)
  970904.944   113  (G. Poyner)
  970906.017   113  (G. Poyner)
  970907.844   114  (J. S. Day)
  970907.944   113  (G. Poyner)
  970908.660   118  (M. Moriyama)
  970909.012   114  (G. Poyner)
  970909.631   120  (M. Moriyama)
  970909.838   113  (J. S. Day)
  970909.876   114  (D. Gill)
  970909.976   114  (G. Poyner)
  970912.973   113  (G. Poyner)
  970913.949   113  (G. Poyner)
  970919.615   117  (M. Moriyama)
  970922.816   113  (J. S. Day)

Regards,
Taichi Kato

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