A color-magnitude diagram for Leo II

Astronomy and Astrophysics – Astronomy

Scientific paper

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Color-Magnitude Diagram, Dwarf Galaxies, Electrophotometry, Giant Stars, Hertzsprung-Russell Diagram, Stellar Color, Stellar Magnitude, Astronomical Catalogs, Astronomical Photography, Globular Clusters, Star Distribution

Scientific paper

A color magnitude diagram (CMD) to V(lim) approximately 22, derived from the CFHT (Canada-France-Hawaii Telescope) prime focus plates is presented. The CMD shows a moderately wide red giant branch, with its brightest stars at V approximately 19.4, (B-V) approximately 1.8, similar in morphology to the giant branch of Fornax. From the magnitude level of the giants, it is estimated that Leo II is (230 + or 20) kpc distant, far enough so that its physical association with our Galaxy may be questioned. Star counts made from the deepest B plate available reveal that the surface density profile of Leo II is well matched by a King (1966) model.

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