On the radial color distribution in the globular cluster M5 equals NGC 5904

Details On the radial color distribution in the globular cluster M5 equals NGC 5904 On the radial color distribution in the globular cluster M5 equals NGC 5904

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...101....1b&link_type=abstract

Astronomy and Astrophysics, vol. 101, no. 1, Aug. 1981, p. 1-6. Research supported by the Consiglio Nazionale delle Ricerche.

Astronomy and Astrophysics

Astrophysics

23

Globular Clusters, Image Reconstruction, Radial Distribution, Red Giant Stars, Stellar Luminosity, Astronomical Photometry, Color, Star Distribution, Stellar Evolution

Scientific paper

The radial distribution of colors in the galactic globular cluster NGC 5904 (M5) detected by Chun and Freeman (1979) is examined by means of plate analysis and image reconstruction. Two plates of the cluster obtained with the 152-cm Ritchey-Chretien telescope of the University of Bologna were scanned with a PDS machine using a 25-micron scanning aperture and a 25-micron step, and pseudo-colors were obtained from the ratios of B and V integrated intensities in each area. It is noted that on these plates, which were used by Chun and Freeman the center of the cluster assumed by them corresponds to a clump of three red giants which dominate its color and contributes the observed gradient. As the center is shifted from these stars, the B-V values derived for each aperture are found to vary, particularly in the smallest apertures. It is pointed out that the only way to avoid such contaminations by red giant clumping in analyses of color gradients in globular clusters is to deal with statistically significant samples.

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