A photometric study of the X-ray globular cluster NGC 6624

Details A photometric study of the X-ray globular cluster NGC 6624 A photometric study of the X-ray globular cluster NGC 6624

Sep 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...224..383l&link_type=abstract

Astrophysical Journal, Part 1, vol. 224, Sept. 1, 1978, p. 383-393. Research supported by Harvard University.

Astronomy and Astrophysics

Astrophysics

41

Astronomical Photometry, Globular Clusters, X Ray Sources, Color-Magnitude Diagram, Extinction, Main Sequence Stars, Milky Way Galaxy, Stellar Luminosity, Tables (Data), Ubv Spectra

Scientific paper

This paper presents a revised color-magnitude diagram of NGC 6624, a globular cluster coincident with the bursting X-ray source 3U 1820-30. The horizontal branch lies at V = 16.05 mag; with the adopted reddening of 0.25 mag, a revised distance of 8.3 + or - 1.2 kpc is determined. The m/H index derived from the slope of the giant branch is -0.7, which makes NGC 6624 one of the more metal-rich clusters in the Galaxy. The one RR Lyrae variable star in the area may be a field star; a red variable near the cluster is probably a member.

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