[AZ-Observing] Re: NGC 1788 status

>> How hot do they have to be? Where's the line drawn between hot enough to
>> flouresce gas and not hot enough. B5?, B3?

     Between B1 and B2.  See the discussion and Hallas color photo at the
NGC/IC Web site:

http://ngcic.com/MilkyWay/default.htm

...where the naked-eye stars in upper Scorpius serve to show the effect
very clearly.

\Brian
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