The mean sequence of the metal-poor globular cluster M30 /NGC 7099/

Details The mean sequence of the metal-poor globular cluster M30 /NGC 7099/ The mean sequence of the metal-poor globular cluster M30 /NGC 7099/

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980aj.....85.1330a&link_type=abstract

Astronomical Journal, vol. 85, Oct. 1980, p. 1330-1340.

Astronomy and Astrophysics

Astronomy

46

Astronomical Photometry, Globular Clusters, Main Sequence Stars, Stellar Evolution, Astronomical Catalogs, Astronomical Photography, Colorimetry, Stellar Magnitude

Scientific paper

Main-sequence photometry, which is used to deduce the age of globular clusters, is presented for 673 stars in the globular cluster M30. The 3.6 m telescope at ESO, and the 1 m Yale and the 4 m telescopes at CTIO are among the locations where photographic measurements were taken. Faint stars were calibrated with a Racine wedge at the ESO and the Tololo telescopes. Equations for correcting photographic measurements are discussed along with methods for estimating reddening and the visual apparent distance modulus. The age of the cluster is deduced at 14.5(+ or - 4.0) x 10 to the 9th yr, using the models of Iben and Rood (1970) and the isochrones of Demarque and McClure (1977).

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