Location of Photo:
Tannay - switzerland
Date/Time of photo:
MEADE RCX400 16' with SBIG ST8 Xme
HR Diagrams that correlate color and absolute magnitude for Open and Globular clusters. It can be seen how in the open clusters there is abundance of blue and hot stars, with only a few red giants, while in the oldest globular clusters, most of the stars have now left the main sequence with only few blue hot stars left. On the M67 HR diagram, thought in the past to be cluster from which our Sun originated, it can be seen the abundance of yellow stars in the middle of the main sequence.