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Graham,
Re: H-Beta filter
I happen to be researching Arp galaxies yesterday and was reading some
info in Uranometria on another topic planetary neb's. Looking for that BH
designation that was listed on the AN the other night, we couldn't figure
out who it belonged to while we were looking at bright neb's. Anyways
they mentioned an object called Campbell's Hydrogen Star in Cygnus which
is best view with a H-beta filter. It's a bright star but once a H-Beta is used
the planetary reveals itself, it was on the list for last night... but....
well... read post #255.
Anyways on BH the only thing that comes close is and perhaps the AN has
shorten it is vdBH van den Berg, S & W Herbst Catalogue of Southern Stars
Embedded in Neblousity.
Regards,CS
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