Other
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109.1628b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 109, no. 4, p. 1628-1633
Other
34
Color-Magnitude Diagram, Dwarf Galaxies, Galactic Clusters, Globular Clusters, Abundance, Astronomical Spectroscopy, Asymptotic Giant Branch Stars, Magellanic Clouds, Main Sequence Stars, Metallicity, Space Observations (From Earth), Star Formation
Scientific paper
We present new results on the cluster system and the field of Fornax based on imaging and spectroscopic observations conducted at Cerro Tololo Inter-American Observatory (CTIO) and Canada-France-Hawaii Telescope (CFHT). The color-magnitude diagram (CMD) of Cluster 2 (C2), which reaches well below the horizontal branch (HB) confirms that it is a bona fide old globular cluster similar to the metal-poor globulars of the galaxy with well-developed blue horizonal branches. From the magnitude of its HB, V=21.4 +/- 0.2, and assuming E(B-V) = 0.03 +/- 0.03, and MV(HB) = +0.6 +/- 0.2 we derive a corrected distance modulus of (V-MV0) = 20.7 +/- 0.3 corresponding to a distance of 138 +20-18 kpc. We have partially resolved Cluster 4 (C4) using HRCam at the CFH telescope and found its HB at V = 21.3 in excellent agreement with the results for C2. The giant branch of C4, which in our diagram consists of a small number of stars, indicates a low metallicity comparable to that of C2. However, integrated-light spectroscopy of the near Ir Ca II triplet confirms the higher value of the metallicity found by other workers also from the study of the integrated light. Our CMD of C4 suggests that the it is an old cluster not grossly different in age from the more metal-poor Fornax clusters. This in turn suggests that the metal enrichment of Fornax was rapid in comparison to its long history of star formation.
Beauchamp Dominique
Hardy Eduardo
Suntzeff Nicolas B.
Zinn Robert
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