Deep CCD photometry in globular clusters. V - M5

Details Deep CCD photometry in globular clusters. V - M5 Deep CCD photometry in globular clusters. V - M5

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...316..189r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 316, May 1, 1987, p. 189-205. NSERC-supported research.

Astronomy and Astrophysics

Astrophysics

72

Astronomical Photometry, Charge Coupled Devices, Globular Clusters, Stellar Evolution, Stellar Spectra, Color-Magnitude Diagram, Metallicity, Stellar Luminosity, Ubv Spectra

Scientific paper

Deep UBV CCD imagery has been obtained in three fields of the galactic globular cluster M5. The locations of these fields are at distances of 8, 21, and 58 core radii. In the middle field the CCD photometry reaches fainter than V = 26. From the color-color diagram of the cluster its metallicity is determined to be [M/H] = -1.13. The distance to M5 is then established from fitting local subdwarfs to the lower main sequence of the cluster. This yields (m-M)v = 14.30. Using the appropriate VandenBerg and Bell isochrones gives an age estimate of 17 Gyr for M5.

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