Main-sequence photometry of the SMC globular cluster Kron 3

Details Main-sequence photometry of the SMC globular cluster Kron 3 Main-sequence photometry of the SMC globular cluster Kron 3

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...286..517r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 286, Nov. 15, 1984, p. 517-528.

Astronomy and Astrophysics

Astrophysics

56

Astronomical Photometry, Globular Clusters, Magellanic Clouds, Main Sequence Stars, Astronomical Catalogs, Horizontal Branch Stars, Stellar Color, Stellar Evolution, Stellar Magnitude

Scientific paper

A color-magnitude (C-M) diagram for the SMC cluster Kron 3 is presented and discussed. The cluster main-sequence turnoff is revealed for the first time, and comparison with theoretical isochrones indicates that the age of Kron 3 is in the range of 5-8 billion years. Current uncertainty in the SMC modulus prevents a more precise determination. A similar C-M diagram for a SMC background field was also determined. It indicates that, unlike the galactic halo, the SMC halo contains stars with a large range of ages, from 1 billion years upwards. An old population (with an age of more than 10 Gyr) is also apparent in the field.

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