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CCD Photometry in the Globular Cluster M4

Published online by Cambridge University Press:  07 August 2017

W.K. Griffiths ,
I.N. Kanatas ,
R.J. Dickens  and
A.J. Penny
W.K. Griffiths
Affiliation:
Department of Physics, Leeds University, Leeds, UK
I.N. Kanatas
Affiliation:
Department of Physics, Leeds University, Leeds, UK
R.J. Dickens
Affiliation:
Rutherford Appleton Laboratory, UK
A.J. Penny
Affiliation:
Rutherford Appleton Laboratory, UK

Extract

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A V, B- V composite colour-magnitude diagram, based upon CCD photometry from V~ 12 on the red giant branch to V~ 25 on the main-sequence has been derived for the globular cluster M4. A distance to the cluster of (m – M)v = 12.84 ± 0.19 is determined and the best match to theoretical isochrones is for the case [Fe/H]=−1.27 and an age of 16±1 Gyr. A differential age comparison with NGC 362 shows that M4 is approximately 1.7 Gyr older.

Type
Poster Papers
Information
Symposium - International Astronomical Union , Volume 164: Stellar Populations , 1995 , pp. 411
Copyright
Copyright © Kluwer 1995 

References

Kanatas, I.N., Griffiths, W.K., Dickens, R.J., Penny, A.J., 1994, MNRAS, in press.Google Scholar
Penny, A.J., 1992, Starman User Manual Version 1.0. Starlink User Note 141.1, Starlink Project, Rutherford Appleton Laboratory.Google Scholar