The age calibration of integrated ultraviolet colors and young stellar clusters in the Large Magellanic Cloud

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Magellanic Clouds, Star Clusters, Stellar Evolution, Ultraviolet Spectra, Andromeda Galaxy, Color-Color Diagram, Iue, Stellar Models

Scientific paper

Integrated colors in selected far-UV bands are presented for a large sample of Large Magellanic Cloud (LMC) clusters. Theoretical calculations of these integrated colors are derived and discussed. The location in the two-color diagram C(18-28), C(15-31) is expected to be a sensitive but smooth function of cluster age for ages in the range 5 to 800 million yr. Theoretical results appear in very good agreement with the observed colors of LMC clusters. From this comparison, the gap in the observed colors is suggested to be caused by the lack of LMC clusters in the range of ages between 200 million to one billion yr. The two-color location of old globulars is discussed, also in connection with available data for the M31 clusters.

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