[AZ-Observing] NGC 1788 status

  • From: Brian Skiff <bas@xxxxxxxxxx>
  • To: AZ-Observing@xxxxxxxxxxxxx
  • Date: Tue, 25 Sep 2001 22:11:47 -0700 (MST)

     Jack Jones has prompted me to respond to JTPests's query about the
status of NGC 1788.  A look in SIMBAD shows that the brightest and also
earliest-type (i.e. hottest) stars involved have spectral types of B9V.
This means they are not hot enough to fluoresce the gas in the cloud, and
thus you have a reflection nebula.  Some of the stars have emmsion-line
shells around them, but that's different deal than for the nebula itself.
     Somebody like Chris Schur could provide a colorful demonstration of
this by getting some color images.  These will show (a prediction here)
that the nebula is bluish, whereas you'd expect an emission object to be
shocking red.  Chris?  Wil?

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