It seems it depends on type of stars make up the Globular. I searched briefly and found a Globular with OB associations are likely to be blue and are found in the disk of our galaxy which is the case of M22. Globular Clusters in the halo of our galaxy are likely to be red.
I'm not sure. I've seen it in other photos of globular clusters, too. One
reason may be that in order to show anything other than a big glare, the brightness had to be adjusted. Possibly the bright stars that remained somehow influenced the color balance to make the dimmer ones look blue. If someone else knows, I'd like to hear. Thanks, Joe
--- On Thu, 6/11/09, M Wilson <astro_outwest@yahoo.com> wrote:
From: M Wilson <astro_outwest@yahoo.com> Subject: Re: [Utah-astronomy] M22, Part 2 To: "Utah Astronomy" <utah-astronomy@mailman.xmission.com> Date: Thursday, June 11, 2009, 8:49 AM
Great writing and article, Joe. I have a question though. M22 and other globulars are supposed to be populated with old aged red stars, but your photo, and many (but not all) others I've seen on the Internet, indicates that the colors of those stars to be blue. Is there an explanation for this?
--- On Wed, 6/10/09, Joe Bauman <josephmbauman@yahoo.com> wrote:
From: Joe Bauman <josephmbauman@yahoo.com> Subject: [Utah-astronomy] M22, Part 2 To: "Utah Astronomy" <utah-astronomy@mailman.xmission.com> Date: Wednesday, June 10, 2009, 11:31 PM
Hi Friends, Here's the second, and for now, last, part of my M22 epic.
http://www.deseretnews.com/blogs/1,5322,10000034,00.html?bD=20090610
Thanks, Joe
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