[vsnet-chat 3923] Re: Possible Nova in Pup

[Taichi Kato <tkato>]

Re: Possible Nova in Pup

> If the located star is indeed the progenitor of the brightened object then 
> its presumed nova nature is improbable.
> I still believe (and might have mentioned it earlier) that the Pup-Pyx-Vel 
> region must be one of the most under explored MW region in the sky and 
> quite a number of CVs might still be discovered there. This Nova? Pup 00 
> might be one of them...

   Please have a look at the VSNET light curve,

   http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/LCs/index/PUPnova2000.html

   What else could it be, if this is not a nova?  Most of other types
of variable stars, showing this kind of abrupt brightening, have been
excluded thanks to earlier survey works.  The lack of infrared excess
mostly excludes FU Ori-type or Sakurai-type stars, and the moderate color
(and the lack of IRAS detection) in quiescence is rather unlike a symbiotic
star.

   I presume this object is one of NB-type slow novae, like DO Aql, HR Del
etc.  Such slow novae are infrequently met (only a few in the era of CCDs),
which can make the type identification difficult.

   This region of the Milky Way was surveyed by Sanduleak and Stephenson,
which had found an intersteing emission line object (like SS 147) in
the vicinity of the possible Nova Pup.  However, the progenitor of this
object was not noticed.  If the object emitted strong forbidden lines,
as many symbiotics do, this object could have been detected by their
survey.

Regards,
Taichi Kato

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