[vsnet-chat 2558] Re: TmzV631

[Brian Skiff <bas@lowell.edu>]

     The IRAS may not apply to the star, or not to the star only.  I first
note that the position error-ellipse semimajor axes are 108"x3" in pa 65---
not only very long but unusually narrow.  The typical error-ellipse is 
something like 25"x10" or even smaller.  Also, although the 12/25 flux ratio
is not unreasonable for an AGB star, the strong 100-micron signal suggests
there is some sort of nebula involved, perhaps in the obscured background
of the field (i.e. not present at visible wavelengths as on the DSS).
Thus the IRAS source could be a composite of a cool star and an HII region,
or something like this.  Another possibility is a cool (even cold) dust-shell
around a fairly hot star (B or A type), akin to beta Pictoris or Vega.

\Brian

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