Abstract
The H-R diagram of the open cluster Tr-1 based on Oja-membership andU, B, V photoelectric photometry is presented. The colour excessE(B-V) is 0 m. 52. The distance modulus to the cluster and its age are, respectively, estimated at 11 m. 6 and 2.6×107 yr.
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Joshi, U.C., Sagar, R. Photoelectric photometry of the open cluster Tr-1. Astrophys Space Sci 48, 225–230 (1977). https://doi.org/10.1007/BF00643053
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DOI: https://doi.org/10.1007/BF00643053