Photoelectric UBVRI sequences in the region of the galactic globular clusters NGC 362, NGC 1261, NGC 6656, and NGC 6809

Astronomy and Astrophysics – Astronomy

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Astronomical Photometry, Globular Clusters, Ubv Spectra, Calibrating, Charge Coupled Devices, Color-Magnitude Diagram, Interstellar Extinction, Red Giant Stars

Scientific paper

UBVRI photoelectric sequences for Galactic globular clusters NGC 362, NGC 1261, NGC 6656 (M22), and NGC 6809 (M55) are herewith presented. All of them include fields suitable for CCD exposures. Except for a few stars in NGC 362 and M22, no RI magnitudes have previously been published for these clusters. For NGC 362, 18 stars are in UBV in common with Harris (1982), and for NGC 6809, four stars are in UBV in common with Lee (1977).

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