Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...305..214d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 305, June 1, 1986, p. 214-227.
Astronomy and Astrophysics
Astrophysics
30
Astronomical Catalogs, Globular Clusters, Magellanic Clouds, Main Sequence Stars, Stellar Evolution, Abundance, Charge Coupled Devices, Color-Magnitude Diagram, Data Reduction, Metallicity, Stellar Spectrophotometry
Scientific paper
The age of the SMC red globular cluster NGC 411 is estimated as 1.5 ± 0.5 Gyr from a C-M diagram that reaches below the cluster main-sequence turnoff. The accuracy of this estimate is limited primarily by uncertainty in the distance modulus of the cluster: at (m - M)0 = 18.8, the age is 1.8 ± 0.3 Gyr, while at (m-M)0 = 19.3 it is 1.2 ± 0.3 Gyr. For these latter results the uncertainty stems primarily from uncertainty in the extent to which convective overshoot affects the theoretical isochrones used for the age determination and, to a lesser extent, from uncertainty in the cluster metal abundance which is estimated as [Fe/H] = -0.9 ± 0.3 dex. For the SMC field in the vicinity of the cluster, zero-age main-sequence fits strongly support the adoption of the smaller (18.8) modulus.
Da Costa Gary S.
Mould Jeremy R.
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