The Large Magellanic Cloud intermediate-age globular cluster NGC 1831

Astronomy and Astrophysics – Astronomy

Scientific paper

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Globular Clusters, Magellanic Clouds, Mass To Light Ratios, Stellar Evolution, Stellar Spectrophotometry, Abundance, Astrometry, Cepheid Variables, Hot Stars, Main Sequence Stars, Stellar Color, Stellar Models

Scientific paper

NGC 1831 is one of the largest, most populous "blue globular clusters" of the LMC. A C-M diagram to V = 21.5 shows a main sequence extending up to V = 18.5 and a well-developed giant branch. Fitting to evolutionary models leads to an age estimate of 300 million years and the giants' colors suggest that [M/H] ≡ -1.0. Spectra of three cluster stars are shown. One is for one of the "anomalous giants" and it indicates that it is probably a composite image. The spectrum of the cluster shows the dominance of the hot main sequence in the integrated light.

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