CCD photometry of the distant halo cluster Palomar 4

Details CCD photometry of the distant halo cluster Palomar 4 CCD photometry of the distant halo cluster Palomar 4

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....91...81r&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 91, Jan. 1986, p. 81-86.

Other

6

Astronomical Photometry, Color-Magnitude Diagram, Globular Clusters, Stellar Evolution, Charge Coupled Devices, Main Sequence Stars, Metallicity, Milky Way Galaxy

Scientific paper

The authors report on BV photometry of the distant globular cluster Palomar 4, obtained with the CCD system at the Cassegrain focus of the CFHT. The resulting color-magnitude diagram, to V(lim) ≡ 24.8, suggests that the main-sequence turnoff of Pal 4 appears at V ≡ 23.8, (B-V) ≡ 0.45. Approximate isochrone fits indicate that the cluster is of intermediate metallicity, and is probably only slightly younger (⪉2 - 4 Gyr) than the more familiar, inner-halo globular clusters. In agreement with another recent CCD study by Christian and Heasley (1985), the authors estimate the distance of Pal 4 to be 100 kpc.

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