Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104..178s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 104, no. 1, July 1992, p. 178-189. Research supported by Cerro Tololo Inter-American
Astronomy and Astrophysics
Astronomy
33
Astronomical Photometry, Charge Coupled Devices, Color-Magnitude Diagram, Globular Clusters, Metallicity, Morphology, Abundance, Cepheid Variables, Luminous Intensity, Monte Carlo Method
Scientific paper
The paper presents CCD photometry in the B and V bands of the Galactic globular cluster NGC 5897. The color-magnitude diagram (CMD) obtained for this cluster is used to examine the properties of the cluster and to compare the NGC 5897 to the well-known globular cluster M3. It was found that the metallicity of the NGC 5897 is in the range of the metallicity of M3 and that the age of NGC 5897 is about 2 Gyr greater than that of M3. The CMD for NGC 5897 also reveals a significant population of blue straggler stars (BSS) more massive than the cluster subgiant branch stars. A pseudomain sequence is constructed for NGC 5897 and the previously studied (Sarajedini and Da Costa, 1991) global cluster 6101, which includes the BSS and extends to the faintest regions of the unevolved main sequence.
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