CCD photometry of the distant southern globular cluster NGC 5824

Details CCD photometry of the distant southern globular cluster NGC 5824 CCD photometry of the distant southern globular cluster NGC 5824

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.243..151c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 243, March 1, 1990, p. 151-158. Research supported by t

Astronomy and Astrophysics

Astronomy

14

Astronomical Photometry, Charge Coupled Devices, Color-Magnitude Diagram, Globular Clusters, Galactic Mass, Interstellar Extinction, Metallicity, Milky Way Galaxy, Southern Sky

Scientific paper

A V, (B-V) C-M diagram for the distant globular cluster NGC 5824 is obtained from CCD observations of 285 stars reaching V = 20.5. Assuming a reddening of E(B-V) = 0.13, the color of the giant branch at the level of the horizontal branch is found to be (B-V)o,g = 0.77, while the apparent distance modulus (V-Mv) is shown to be 18.0 + or - 0.2. Also, an Fe/H abundance ratio = -1.7 and a heliocentric distance of 33 + or - 3 kpc are estimated. The results produce a galactocentric distance of 25 kpc. This result is combined with the radial-velocity determination of Hesser, Shawl, and Meyer (1986), making it possible to plot the representative point of the cluster in Lynden and Bell's (1983) velocity-distance diagram.

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