Abstract
We discuss deep J and K images of the nearby globular cluster M4. The colour of the RGB locus is consistent with [Fe/H] ~ -1.3, while the main-sequence mass function is flat or decreasing down to 0.2M⊙. Isochrones with ages of at least 16 Gyr are required to fit the CMD near the main-sequence turn-off.
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© 1994 Springer Science+Business Media Dordrecht
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Davidge, T.J., Simons, D.A. (1994). Deep Near-Infrared Imaging of the Globular Cluster M4. In: McLean, I.S. (eds) Infrared Astronomy with Arrays. Astrophysics and Space Science Library, vol 190. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1070-9_21
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DOI: https://doi.org/10.1007/978-94-011-1070-9_21
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-4466-0
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