Figure 13 from Ultraviolet Properties of Galactic Globular Clusters with GALEX. I. The Color-Magnitude Diagrams

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Ultraviolet Properties of Galactic Globular Clusters with GALEX. I. The Color-Magnitude Diagrams

Authors: Ricardo P. Schiavon, Emanuele Dalessandro, Sangmo T. Sohn, Robert T. Rood, Robert W. O'Connell, Francesco R. Ferraro, Barbara Lanzoni, Giacomo Beccari, Soo-Chang Rey, Jaehyon Rhee, R. Michael Rich, Suk-Jin Yoon, and Young-Wook Lee

Schiavon et al. 2012 The Astronomical Journal 143 121.

Provider: AAS Journals

Caption: Figure 13.

Observed CMD of one of our densest clusters, NGC 7089, illustrating the effect of crowding in our photometry. Gray triangles represent sources within 2′ of the cluster center, and all others are located between that inner radial distance and the cluster tidal radius (1300''). The main effect of crowding is to displace stars toward brighter FUV magnitudes and redder colors. The color effect is due to the fact that crowding is more severe in the NUV than in the FUV.

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