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Discovery of Extended Main Sequence Turnoffs in Galactic Open Clusters

Marino, Anna Fabiola; Milone, Antonino P; Casagrande, Luca; Przybilla, N; Balaguer-Núñez, L; Di Criscienzo, M; Serenelli, A; Vilardell, F


The color-magnitude diagrams (CMDs) of Galactic open clusters are widely considered to be the prototypes of single stellar populations. By using photometry in ultraviolet and optical bands we discovered that the nearby young cluster NGC 6705 (M11) exhibits an extended main-sequence turnoff (eMSTO) and a broadened main sequence (MS). This is the first evidence of multiple stellar populations in a Galactic open cluster. By using high-resolution Very Large Telescope (VLT) spectra we provide direct...[Show more]

CollectionsANU Research Publications
Date published: 2018
Type: Journal article
Source: Astrophysical Journal Letters
DOI: 10.3847/2041-8213/aad868
Access Rights: Open Access


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