Positions, magnitudes and colours for stars in the core of M 3

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Globular Clusters, Position (Location), Stellar Color, Stellar Magnitude, Astronomical Photometry, Color-Magnitude Diagram, Hertzsprung-Russell Diagram, Tables (Data)

Scientific paper

Positions, magnitudes and colors are given for 785 stars in a 1 arc min x 1 arc min field in the center of the globular cluster NGC 5272 (M 3). A color-magnitude diagram is presented for these stars and is compared to that of the external zone (Sandage and Katem, 1982). Radial variations of B and V brightnesses, B-V color, red giants and blue horizontal branch stars projected surface densities are plotted for the concerned area. The completeness of this sample of stars is then investigated with the use of artificial clusters.

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