Abstract
Integrated colors of M3, M5, M13, and M92 are calculated from the luminosity function, the color-magnitude diagram, and the two-color diagram to compare them with observed ones. The results show good agreements for M3, M13, and M92 and the discrepancy for M5. Possible causes for this discrepancy are discussed.
To study the way in which integrated colors are affected by changes in the distribution of stars in the color-magnitude diagram, we calculate the integrated colors by taking into account changes in the distribution of horizontal branch stars and in the ratio of the number of horizontal branch stars to that of red giant branch stars. The result shows that (B-V) color varies within the range of about 0.1 mag with changes in the distribution of horizontal branch stars, implying that the cluster with a well-developed blue horizontal branch has bluer intrinsic integrated (B-V) color than that with yellow one. This tendency is compared with observation.
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Toyama, K., Nishimura, M. & Kaneko, N. Integrated colors of globular clusters. Astrophys Space Sci 43, 47–55 (1976). https://doi.org/10.1007/BF00640554
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DOI: https://doi.org/10.1007/BF00640554