A search for red-dwarf members of the Coma star cluster

A photometric search for red dwarfs belonging to the Coma star cluster is reported. Observations in B, V, R and I were obtained for 88 stars in the region of the Coma cluster using a pulse-counting photometer with a GaAs photomultiplier attached to a 0.9-m reflector. Cluster membership of the stars was determined on the basis of the deviation of stellar position in V, (B-V) and V, (R-I) diagrams from the nominal main sequence. Of the 25 stars suggested as possible members by Artyukhina (1955) and the 29 additional stars suggested by Malmquist (1927), only three stars are found to be possible members on the basis of this criterion. The possible membership of only one of the two stars suggested by Argue and Kenworthy on the basis of proper motions and photographic photometry is confirmed. It is concluded that the number of red-dwarf members of the Coma cluster with V magnitudes between 10.5 and 15.5 is unlikely to be greater than ten.

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