Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pasp...96..947h&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 96, Dec. 1984, p. 947-959.
Astronomy and Astrophysics
Astronomy
21
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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