Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...244..303a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 244, no. 2, April 1991, p. 303-309.
Astronomy and Astrophysics
Astrophysics
6
Astronomical Photometry, Charge Coupled Devices, Globular Clusters, Metallicity, Stellar Color, Background Radiation, Balmer Series, Brightness, Color-Magnitude Diagram, Horizontal Branch Stars, Radial Distribution, Red Giant Stars, Star Distribution
Scientific paper
The surface and stellar CCD photometry of the central region of NGC 4147 based on 2-m-telescope frames is discussed, including the color-magnitudes of 532 resolved stars. It is pointed out that this brightness and color surface photometry reveals 'abnormal' features because this is a faint cluster in which a few bright stars contribute to the surface brightness distribution significantly. Using a star-stripping technique, it is shown that without its bright stars, NGC 4147 appears as normal as other King-model clusters. As for the radial distribution of red giants and BHB stars, a central concentration of HB stars with respect to RG is found. It is concluded that if globular clusters are to be classified as post-core-collapse clusters or King-model clusters, NGC 4147 should fall in the second class.
Auriere Michel
Lauzeral C.
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