CCD photometry of the sparse halo cluster E3

Details CCD photometry of the sparse halo cluster E3 CCD photometry of the sparse halo cluster E3

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pasp...97..665m&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 97, Aug. 1985, p. 665-675.

Astronomy and Astrophysics

Astronomy

56

Charge Coupled Devices, Color-Magnitude Diagram, Globular Clusters, Stellar Evolution, Stellar Luminosity, Stellar Spectrophotometry, Astronomical Coordinates, Binary Stars, Main Sequence Stars, Star Clusters, Star Distribution, Tides

Scientific paper

New photometry in B and V for the sparse halo cluster E3 has been obtained with the prime-focus CCD camera at the CTIO 4-m telescope. The principal sequences are better defined than in the previous color-magnitude (C-M) diagrams, but the large scatter of evolved stars above the turnoff remains. The C-M morphology, inferred old age, and position in the halo definitely indicate that E3 is a globular cluster. Evidence for possible main-sequence binaries appears in the C-M diagram in the form of a sequence parallel to the cluster main sequence and three-quarters of a magnitude above it. The luminosity function drops off sharply about 2.5 mag below the turnoff, supporting the suggestion by van den Bergh, Demers, and Kunkel (1980), that the cluster is severely truncated by tidal forces.

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