Photometric studies of the globular clusters in M31. I - The color-magnitude and two-color diagrams, and the color-index dependence of the apparent distribution

Astronomy and Astrophysics – Astronomy

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Andromeda Galaxy, Globular Clusters, Stellar Color, Stellar Spectrophotometry, Magellanic Clouds

Scientific paper

Color-magnitude (V, B-V) and two-color (U-B, B-V) diagrams are presented for the diffuse objects currently or previously regarded as globular clusters in the Andromeda Nebula (M31). Apparent distributions in the field of M31 are mapped for objects in different parts of the two-color diagram. Although most of the objects are indeed old globular clusters, some large young (globular) clusters and middle-aged clusters congregate near the M31 plane. The young clusters are more intimately associated with the spiral structure. A number of the objects are evidently distant galaxies. The globular clusters in the Galaxy and in M31 have different age distributions.

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