BV CCD Photometry of M71: Distance and Age

Details BV CCD Photometry of M71: Distance and Age BV CCD Photometry of M71: Distance and Age

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jass...21....1y&link_type=abstract

Journal of Astronomy and Space Sciences. Vol. 21, no. 1, p.1-10

Astronomy and Astrophysics

Astronomy

Globular Cluster, M71, Ccd Photometry, Color-Magnitude Diagram, Distance, Relative Age

Scientific paper

We present BV CCD photometry of metal-rich globular cluster M71. Based on our color-magnitude diagram (CMD), we derive the distance to M71 using a sample of Hipparcos subdwarfs of similar metallicity. Our distance modulus is (m-M)V=13.46(± 0.17). CMD comparison was also made between M71 and 47 Tuc. We confirm that there exists a significant age difference(> 2 billion years) in spite of their similarity in metallicity.

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