Statistics – Computation
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...321..735d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 321, Oct. 15, 1987, p. 735-744.
Statistics
Computation
15
Astronomical Photometry, Galactic Clusters, Globular Clusters, Magellanic Clouds, Stellar Evolution, Algorithms, Computational Astrophysics, Stellar Luminosity
Scientific paper
The age of the LMC star cluster NGC 2193 is estimated as 2.2 + or - 0.6 Gyr from CCD photometry that reaches below the cluster main-sequence turnoff. The cluster is thus another member of the large set of LMC red clusters that have ages in the range of 1 to 3 Gyr. The principal cause of uncertainty in the estimated age is uncertainty in the LMC distance modulus; at (m - M)0 = 18.2, the age is estimated as 2.5 + or - 0.4 Gyr, while at (m - M)0 = 18.7, the age is 1.8 + or - 0.4 Gyr. A metal abundance of (Fe/H) = -0.5 + or - 0.3 dex is deduced for NGC 2193 from the color of the cluster giant branch. The C-M diagram for the LMC field near NGC 2193 shows the commonly found population of intermediate age stars but, in this case, the diagram is clearly dominated by a population of older stars. Isochrone fits indicate an age for this older population in excess of 7 Gyr, with some indication of ages perhaps as old as 13 Gyr. This latter population is the oldest LMC field population yet dated.
Da Costa Gary S.
King Christopher R.
Mould Jeremy R.
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