Blue Stragglers and Clump Stars in M67

Details Blue Stragglers and Clump Stars in M67 Blue Stragglers and Clump Stars in M67

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jkas...17...37j&link_type=abstract

Journal of Korean Astronomical Society, vol.17, p.37-49

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Scientific paper

UBV photoelectric observations were carried out for bright stars in M67 and the masses of clump stars and giant stars were derived in M67 and the other old open clusters, NGC 188, NGC 2420, NGC 2506 and IC 4651. The mean mass of clump stars in the five clusters ranges m=0.5 ~ 1.0m(sun), and its ratio to the mean mass of giant stars is about 0.83. The number ratio of blue stragglers to the stars brighter than the turn-off of main sequence increases with cluster age whereas that of clump stars decreases with age. These results imply that the clump stars and blue stragglers are at the phase of horizontal branch evolution.

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