Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26as...57..177g&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 57, Aug. 1984, p. 177-188.
Astronomy and Astrophysics
Astrophysics
34
Astronomical Photometry, Globular Clusters, Variable Stars, Astronomical Catalogs, Cameras, Hertzsprung-Russell Diagram, Stellar Color, Stellar Composition, Stellar Luminosity
Scientific paper
The results of the second of two photometric investigations of remote globular clusters are presented, with particular emphasis given to the CCD photometry of the outer halo cluster Pal 3 (RA = 10 h, 03 m). The data are based on CCD images obtained with the 1.5 meter Danish telescope at La Silla. It is found that the C-M diagram for Pal 3 closely resembles the one for Pal 12, suggesting that Pal 3 is a moderately metal-rich cluster (Fe/H of about 1.4). Among the stars found in this cluster were three RR Lyrae and a possible population II cepheid. An approximate estimate of cluster diameters and of concentration parameters yielded values of d = 440 arcsec and c = 0.9, respectively. The orbit of the cluster is possibly eccentric at 0.5. Tables are presented which list derived values for luminosity, radial density, and the distribution of color magnitudes within the cluster.
Gratton Raffaele G.
Ortolani Sergio
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