Fig. 5 from Hubble Space Telescope Observations of the Main Sequence of M4

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Hubble Space Telescope Observations of the Main Sequence of M4

Authors: H. B. Richer, G. G. Fahlman, J. Brewer, S. Davis, J. Kalirai, P. B. Stetson, B. M. S. Hansen, R. M. Rich, R. A. Ibata, B. K. Gibson, and M. Shara

Richer et al. 2004 The Astronomical Journal 127 2771.

Provider: AAS Journals

Caption: Fig. 5.

CMDs in the four annuli with the cluster main‐sequence fiducial shifted brighter by 0.75 mag to indicate the location of an equal‐mass binary sequence. Saturation is important for F555W less than 20, particularly in the outer field. It appears from this diagram that the equal‐mass cluster binary frequency is very low.

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