Red Giant Branch of the Metal Poor Globular Clusters: II. Bump, Tip, and Distance of NGC 1904

Astronomy and Astrophysics – Astronomy

Scientific paper

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Rgb Bump, Rgb Tip, Distance, Ngc 1904, Photometry

Scientific paper

From the BV images of the metal-poor globular cluster NGC 1904 obtained with the 2K CCD camera equipped on the BOAO 1.8m telescope, we construct (B-V, V) color-magnitude diagram of the cluster. The apparent V magnitudes of the RGB bump and tip have been measured from the luminosity function of the iteratively selected RGB stars in NGC 1904. Theoretical absolute M_V magnitudes of the RGB bump and tip are estimated using the Yonsei-Yale isochrones. The distance modulus of NGC 1904 has been derived by comparing the observed apparent V magnitude with the estimated absolute M_V magnitude of the RGB bump and tip.

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