Stephen Paul wrote:
As has been pointed out elsewhere, open clusters are considered to be
relatively young with stars of blue and white. So what's the deal with the
high population of red stars in NGC 884 (one of the clusters in the double
cluster). I've seen red stars in other open clusters, like the bright core
star of M37.

You might be interested in the following paper on the Double Cluster red
supergiants that I published in the Journal of the British Astronomical
Association a few years ago:

http://www.tristram.uklinux.net/vari...le-cluster.pdf

Unfortunately, the photo on the first page got left-right inverted
during the publication process.

Tristram

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http://www.tristram.uklinux.net