Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jass...23...97k&link_type=abstract
Journal of Astronomy and Space Sciences. Vol. 23, no. 2, 97-104
Astronomy and Astrophysics
Astronomy
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.
Choi Yemon
Chun Sae Hwan
Jung Jae Joon
Kang A.
Kim Won-Jang
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