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Re: [APML] M13 image

Hi group

Blue stars are not forbidden in globular clusters. There is a special kind of (variable?) star called blue stragglers.
AFAIK these are stars which outer layers were stripped off by encounters with other stars in the center of the cluster.
I do NOT know if they could account for the number of blue stars in your beautiful images...

BTW: in southern Tyrol a public observatory was inaugurated last weekend. The telescope was made by Philipp Keller.
During tests he made some images, which include one of M13 too - not as colorful as the images currently "en vogue" but
quite nice otherways: http://www.astrooptik.com/Bildergalerie/GummerGallery/M13.htm

hmm, I nearly forgot: 0.8m Cassegrain....

The M57 is also very remarkable:
http://www.astrooptik.com/Bildergalerie/GummerGallery/M57.htm

cheers

Philipp Salzgeber



----- Original Message -----
From: "Tony Hallas" <tonyhallas@foothill.net>
To: <astro-photo@seds.org>
Sent: Thursday, June 27, 2002 7:55 PM
Subject: Re: [APML] M13 image


Brian,

     Well you sure picked up more faint stars than I did... what I was looking for and found in your image were the
large quantity of blue stars... this flies in the face of the theory that globular clusters are made of mostly old
stars... your core is kind of burned up but in mine you can see blue stars everywhere, and in that mixture is sprinkled
some old yellow-orange stars and here and there a few really red stars. But far too many young blue stars to buy into
the theory that there is no new star formation going on... this would suggest that globulars are a dynamic happening,
not some remnant from an old process.
     If you bring your image into PS as a 16 bit Tiff file, can't you bring more detail into the core? I think it would
be interesting to see what you've got hiding in there!

    Thank you for telling me about the image,

    Have a good one,

         Tony



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