[vsnet-campaign-nova 757] On possible nova in Mon (GSC 4822.39)

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

On possible nova in Mon (GSC 4822.39)

   To my knowledge, the only "classical" nova which displayed K-type
spectrum at maximum is V1148 Sgr in 1943 (Mayall AJ 54, 191).  This nova
showed rich metal (and possibly TiO) absorption lines.  Mayall reported
the spectrum became emission-line dominated five days later.  Since neither
"remnant" star of comparable magnitude nor IR counterpart is found in its
vicinity, the object should have been a nova, rather than a flash-type event
on a K-type star.  The present object in Mon may be a variety of such
an object with a slower expansion velocity.  Since the present object may
also become emission-line dominated at a later stage, continuous spectroscopic
follow-up observations are important.

   It may be noteworthy that V1148 Sgr was suspected to be a special stage
of an explosive mass-loss event (cf. ApJ 353, 168 for a negative comment).

Regards,
Taichi Kato

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