[vsnet-chat 3916] RE: [vsnet-campaign-nova 104] Possible Nova in Pup

["Sebastian Otero" <varsao@fullzero.com.ar>]

----- Original Message -----
From: Taichi Kato
> Possible Nova in Pup
>
>     The accurate position provided by H. Abe agrees the position of a
14-th
> mag USNO star within 1-2 arcsec.  If this star is indeed the progenitor
> of the erupting object, the color from the comparison between the visual
> and 2MASS magnitudes becomes V-J = +2.  The color is not particularly red
> in this field.  Even assuming that the object is not significantly
> reddened, the color is still bluer than most of symbiotic stars, which
> have V-J colors of +3 to +5 or even larger.  If the object is a nova, the
> color suggests either a) usual cataclysmic variable with moderate
reddening
> or b) cataclysmic-type binary with a relatively evolved secondary.
> [e.g. U Sco (Porb=1.2d) has a V-J color of +1.5].

What would be the B-V color index of the object? I observed it as a
yellow-orange star.

Cheers,
Sebastian.



>
> Regards,
> Taichi Kato
>


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