Age and metal abundance of a globular cluster, as derived from Stromgren photometry

Details Age and metal abundance of a globular cluster, as derived from Stromgren photometry Age and metal abundance of a globular cluster, as derived from Stromgren photometry

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982msngr..28....4n&link_type=abstract

ESO Messenger, June 1982, p. 4-7.

Astronomy and Astrophysics

Astronomy

7

Astronomical Photometry, Chronology, Cosmology, Globular Clusters, Hubble Constant, Metallicity, Electrophotometers, Red Shift

Scientific paper

The results of a photoelectric uvby-beta survey of turnoff stars in globular clusters to improve the accuracy of the lower limits to estimates of the age of the Universe are reported. Emphasis is placed on observations of stars in the 8-11 mag range in the second-nearest globular cluster, NGC 6397. Only objects in the outer regions were studied, due to the density of the stars in the center of the cluster. A color excess within 0.02 of 0.14 was found, along with a metal abundance within 0.2 of -1.6, with a Z of 0.0004. The age of NGC 6397 is calculated to have a lower limit of 16 billion yr., which agrees with a Hubble constant of 52 if the density parameter is less than 0.2.

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