Halo globular cluster NGC 5053

Details Halo globular cluster NGC 5053 Halo globular cluster NGC 5053

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977aj.....82..389s&link_type=abstract

Astronomical Journal, vol. 82, June 1977, p. 389-394, 449.

Astronomy and Astrophysics

Astronomy

46

Astronomical Photography, Electrophotometry, Galactic Evolution, Globular Clusters, Cepheid Variables, Color-Magnitude Diagram, Colorimetry, Hertzsprung-Russell Diagram, Milky Way Galaxy, Stellar Luminosity, Stellar Magnitude, Ubv Spectra

Scientific paper

Results are reported for a UBV photometric study of the remote high-latitude globular cluster NGC 5053, which is about 15 kpc from the galactic plane and nearly directly above the solar neighborhood. A color-magnitude diagram and luminosity function are obtained from a photoelectric sequence of 37 stars with V magnitudes of 9.7 to 17.1 and from iris photometry of three photographic plates in each color. The horizontal branch is found to have a well-defined RR Lyrae gap at a V magnitude of 16.63, the reddening is estimated to be 0.01 + or - 0.02 magnitude, and the true distance modulus is determined as 16.00. It is concluded that NGC 5053 is among the metal-poorest clusters known, has a normal luminosity function, and must have been formed high in the halo.

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