Main-sequence photometry for three galactic globular clusters

Details Main-sequence photometry for three galactic globular clusters Main-sequence photometry for three galactic globular clusters

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pasp...95..951h&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 95, Dec. 1983, p. 951-966. Research supported by the Na

Astronomy and Astrophysics

Astronomy

20

Astronomical Photometry, Galactic Evolution, Globular Clusters, Main Sequence Stars, Milky Way Galaxy, Calibrating, Data Reduction, Error Analysis

Scientific paper

With the SIT Vidicon camera operated in direct mode at the CTIO 4-m telescope, V,(B-V) color-magnitude data have been obtained for the globular clusters 47 Tuc (NGC 104,C0021-723), NGC 288(C0050-268), and NGC 1904(C0522-245). These data in general cover the V magnitude range from 16 to 22, and accurately define the main sequence turnoff positions for all three clusters. By comparison of our data with the recent theoretical isochrones of VandenBerg (1983), it is found that the main sequence loci of the three clusters can be succesfully matched by ages in the range of 16 + or - 3 billion years, if heavy-element abundances which are similar to spectroscopically derived estimates are adopted.

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