Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...291..230d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 291, April 1, 1985, p. 230-236.
Astronomy and Astrophysics
Astrophysics
28
Color-Magnitude Diagram, Globular Clusters, Metallicity, Milky Way Galaxy, Astrometry, Charge Coupled Devices, Error Analysis, Galactic Nuclei, Giant Stars, Horizontal Branch Stars, Stellar Spectrophotometry
Scientific paper
The CTIO 4 m prime focus CCD system has been used to determine a color-magnitude diagram for the distant stellar system in Eridanus (C0422-213). The diagram confirms that this system is a distant globular cluster similar in nature to such systems as Pal 3 and Pal 4. From the magnitude of the horizontal-branch stars, a distance modulus of 19.55 is derived placing the cluster in the outer halo, 84 kpc from the Galactic center. The C-M diagram reveals a red horizontal branch, as is apparently the norm for outer halo clusters, while the giant branch parameters (B-V)o,g and Delta V1.4 suggest Fe/H = -1.35 + or - 0.2 for the cluster. Thus C0422-213 joins Pal 14 as an intermediate metal abundance cluster in the outer Galactic halo.
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