[vsnet-chat 366] transient? supersoft source in M3

[Taichi Kato <tkato>]

   After Katsura Matsumoto-san's suggestion, I have learned there was a
transient supersoft X-ray source in the globular cluster M3 (ApJ 410, L87).
The source was observed with ROSAT twice (January and June) in 1992, and
a remarkable decrease in the soft X-ray flux was observed in between.
The authors of the paper suggested a possibility of viewing a late stage
of a slow nova (symbiotic nova).  Can any old photographs or images prove
or disprove the existence of an optical nova around 1990 (the epoch of
Einstein's observation)?  At a distance of M3, a typical slow nova would
reach V=10.

   The position of the object is:

  1E1339.8+2837 = RXJ1342.1+2822
                  13h 42m 09s.75  +28o 22' 45".1 (J2000.0, +/-3")

Regards,
Taichi Kato

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