Platais, Imants; Melo, C; Quinn, S. N; Clem, J L; de Mink, S. E.; Dotter, Aaron; Kozhurina-Platais, V; Latham, D.W.; Bellini, A
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...[Show more]
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