Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105..933j&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 105, no. 3, p. 933-937.
Astronomy and Astrophysics
Astronomy
8
Andromeda Galaxy, Astronomical Photometry, Charge Coupled Devices, Color-Magnitude Diagram, Dwarf Galaxies, Star Clusters, Astronomical Catalogs, Astronomical Photography, Morphology
Scientific paper
CCD photometry of Andromeda IV was obtained during discretionary time in August of 1989 at the Canada-France-Hawaii Telescope on Mauna Kea and the data were reduced at CFHT during the summer of 1991. And IV has been catalogued both as a dwarf galaxy and as an open star cluster in M31. The color-magnitude diagrams presented indicate that this object has a young population of stars with a narrow age range, consistent with the characteristics of an open star cluster or stellar association. A radial velocity measurement taken from the literature and analyzed with respect to the rotation curve of M31 indicates this object resides in the disk of the Andromeda Galaxy, strengthening the conclusion that it is indeed a very large open star cluster or a densely populated stellar association rather than a dwarf irregular galaxy.
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