[vsnet-chat 146] Re: V384 Sco..

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

Berto Monard wrote:
> As to the others, V3941 Sgr & Co could turn out to be in the same
> boat as AF Sco, also once believed to be a CV and later be
> revealed as a Mira variable.

    I should add some members (too heavy for a boat?) AC Sco, UY Vul, UZ Vul,
HN Cyg and many others.

    As to V3941 Sgr, the referred chart in Downes & Shara catalog (JAAVSO)
is not accesible in our library (hope someone in the AAVSO may help clarifying
the identity).  But at the time of observation (before Downes and Shara --
I wonder how I could get a chart), I was farily confident of the identity
of V3941 Sgr with a red star, though I should check again the CCD frames.
Another star V3914 Sgr (UG:) also coincides with a red star.

> NN Sgr: I didn't know a star with such a name existed. The object
> in question has no official name (and ?? Sgr was already used for
> another one)! NN stands for 'nomen nescio' = latin for 'I don't
> know the name'. The refered object is categorised as UG: (1990) at 
> (2000) position 17 59 18 -29 10,  taken also from the D&S cv- atlas.
> Maybe you got some more on this suspected DN.

    I now understand.  In Japanese we say "na-na-shi" for "no name" -- another
interpretation for "NN", though Baba-san rather uses Hoge-Hoge in the same
meaning (^_^;).  NN Ser is another well-known variable star among CV
enthusiasts.

    Anyway, your "NN" Sgr at 17 59 18 -29 10 is called Nova Sgr 1990 (as
called in IAUCs), which was first discovered as a possible nova, later
turned out to be by spectroscopy a possblie WZ Sge-type object.  If only
the star erupted three months later, I might have tried CCD photometry.
Happy to hear this star has been monitored!

Regards,
Taichi Kato

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