Color-magnitude diagram of Palomar 4 - CCD photometry

Details Color-magnitude diagram of Palomar 4 - CCD photometry Color-magnitude diagram of Palomar 4 - CCD photometry

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...303..216c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 303, April 1, 1986, p. 216-225.

Astronomy and Astrophysics

Astrophysics

37

Astronomical Photometry, Charge Coupled Devices, Color-Magnitude Diagram, Globular Clusters, Stellar Evolution, Asymptotic Giant Branch Stars, Horizontal Branch Stars, Main Sequence Stars, Metallicity, Tables (Data)

Scientific paper

Photometry of the globular cluster Pal 4 was obtained with the RCA CCD camera on the 3.6 m Canada-France-Hawaii Telescope on Mauna Kea. The color-magnitude diagram of the cluster shows a well-defined red horizontal branch, typical of outer halo systems, and an asymptotic giant branch well separated from the giant branch. The population of Pal 4 has been sampled to the main-sequence turnoff region (V = 25), allowing a detailed comparison of this distant object with theoretical models. The cluster parameters consistent with the CCD data are (m - M)0 = 20.1 + or - 0.1 mag, E(B - V) = 0.02 + or - 0.02, and Fe/H forbidden line = -1.7 + or - 0.1 with Y =0.2. The age of the cluster, determined by comparison with the isochrones of VandenBerg and Bell (1985) is consistent with an age of 15 + or - 1 Gyr, similar to inner halo globular clusters with ages determined in the same way.

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