Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apjs...82..145b&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 82, no. 1, Sept. 1992, p. 145-165.
Astronomy and Astrophysics
Astrophysics
46
Binary Stars, Color-Magnitude Diagram, Globular Clusters, Main Sequence Stars, Stellar Spectrophotometry, Charge Coupled Devices, Stellar Luminosity, Stellar Mass
Scientific paper
Photometry based on a mosaic of CCD images in B and V is presented for the globular cluster NGC 288. The spatial coverage ranges from the cluster core to about 6 core radii, and stars have been measured over the absolute visual magnitude range -1.2 to 8.4. The cluster is shown to contain a significant number of blue straggler stars in the central regions, and there is an excess of objects brighter and redder than the single-star main-sequence in the color-magnitude plane. These objects are interpreted as a population of main-sequence binary stars. With this interpretation, the explicity measured fraction of binary stars is 10 percent, which sets a lower limit for the total binary population.
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