Deep CCD photometry in globular clusters. VIII - M12

Details Deep CCD photometry in globular clusters. VIII - M12 Deep CCD photometry in globular clusters. VIII - M12

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98.1335s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 98, Oct. 1989, p. 1335-1353. Research supported by NSERC.

Astronomy and Astrophysics

Astronomy

27

Astronomical Photometry, Charge Coupled Devices, Globular Clusters, Binary Stars, Color-Magnitude Diagram, Horizontal Branch Stars, Mass Spectra, Metallicity

Scientific paper

Results are presented on UBV photometry, obtained using the Canada-France-Hawaii Telescope, for a single field (2.2 x 3.5 arcmin) located 3.5 arcmin from the center of the galactic globular cluster M12 (NGC 6218). The color-magnitude diagram (CMD) indicated a possible existence of a sequence of binary stars. The fundamental cluster parameters for M12 derived from the present data are E(B-V) = 0.23 + or - 0.04 and (m-M)V = 14.25 + or - 0.20. An overlay of the isochrones and the CMD yields a best-estimate age of 17 Gyr.

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