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Rich Open Clusters
Below are 4 very rich open clusters.
The diagrams give individual star magnitudes and colours.
Blue is on the left red is on the right.
http://www.univie.ac.at/webda/cgi-bin/plot_cmd.cgi?ngc2477+NGC+2477
http://www.univie.ac.at/webda/cgi-bin/plot_cmd.cgi?ngc4755+NGC+4755
http://www.univie.ac.at/webda/cgi-bin/plot_cmd.cgi?ngc6705+NGC+6705
http://www.univie.ac.at/webda/cgi-bin/plot_cmd.cgi?ngc7789+NGC+7789
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