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• W3100418719 endingPage "L8" @default.
• W3100418719 startingPage "L8" @default.
• W3100418719 abstract "We present a detailed analysis of the upper main sequence of the ∼1.3 Gyr old open cluster Trumpler 20. High-accuracy BVI photometry combined with the Very Large Telescope/FLAMES medium-resolution spectroscopy of 954 stars is essential to understanding the unusual appearance of the color–magnitude diagram (CMD), initially suggesting multiple populations in Trumpler 20. We show that differential reddening is a dominant contributor to the apparent splitting/widening of the main-sequence turnoff region. At its extreme, the excess differential reddening reaches Δ(B − V) ∼ 0.1 while the adopted minimum reddening for the cluster is E(B − V) = 0.36. A unique sample of measured projected rotational velocities indicates that stellar rotation is high near the main-sequence turnoff, reaching vsin i ∼ 180 km s−1. By dividing the upper main-sequence stars into two equal groups of slow and fast rotators, we find that fast rotators have a marginal blueshift of δ(V − I) ∼ −0.01, corresponding to a difference in the median vsin i of ∼60 km s−1 between these subsamples. We conclude that stellar rotation has an insignificant effect on the morphology of the upper main sequence of this intermediate-age open cluster. Trumpler 20 appears to contain a single coeval population of stars but there is evidence that the red clump is extended." @default.
• W3100418719 created "2020-11-23" @default.
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• W3100418719 date "2012-05-01" @default.
• W3100418719 modified "2023-10-14" @default.
• W3100418719 title "THE EFFECTS OF DIFFERENTIAL REDDENING AND STELLAR ROTATION ON THE APPEARANCE OF MULTIPLE POPULATIONS IN STAR CLUSTERS: THE CASE OF TRUMPLER 20" @default.
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• W3100418719 doi "https://doi.org/10.1088/2041-8205/751/1/l8" @default.
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