[AZ-Observing] Re: (no subject)

  • From: Brian Skiff <bas@xxxxxxxxxx>
  • To: <az-observing@xxxxxxxxxxxxx>
  • Date: Sat, 18 Apr 2015 11:31:03 -0700

On Fri, 2015-04-17 at 17:13 -0700, Albert Barr wrote:

This is another Southern Hemisphere shot I just processed known as the Gem
Cluster or NGC 3293. It is about 8400 light years from Earth and very close
to the Eta Carinae Nebula which is why there is so much red dust in the

The brightest blue stars in NGC 3293
are B0-type supergiants, so are hot enough to
fluoresce the gas nearby --- it's H-alpha emission,
not red dust, though there's surely dust there, too,
since that is detectable visually.
The one red star in the cluster is an
early-M supergiant, very much like Betelgeuse.
That gives you a bit of a perspective as to
how many really luminous stars there are in
this cluster, which is a southern showpiece.
There's nothing comparable to it in the north.


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