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• W4313263503 endingPage "4009" @default.
• W4313263503 startingPage "3992" @default.
• W4313263503 abstract "ABSTRACT The nearest region of massive star formation – the Scorpius–Centaurus OB2 association (Sco–Cen) – is a local laboratory ideally suited to the study of a wide range of astrophysical phenomena. Precision astrometry from the Gaia mission has expanded the census of this region by an order of magnitude. However, Sco–Cen’s vastness and complex substructure make kinematic analysis of its traditional three regions, Upper Scorpius, Upper Centaurus-Lupus, and Lower Centaurus-Crux, challenging. Here, we use chronostar, a Bayesian tool for kinematic age determination, to carry out a new kinematic decomposition of Sco–Cen using full six-dimensional kinematic data. Our model identifies eight kinematically distinct components consisting of 8185 stars distributed in dense and diffuse groups, each with an independently fit kinematic age; we verify that these kinematic estimates are consistent with isochronal ages for K dwarfs. Both Upper Centaurus-Lupus and Lower Centaurus-Crux are split into two parts. The kinematic age of the component that includes PDS 70, one of the most well-studied systems currently forming planets, is 15 ± 3 Myr." @default.
• W4313263503 created "2023-01-06" @default.
• W4313263503 creator A5014140391 @default.
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• W4313263503 creator A5041808882 @default.
• W4313263503 creator A5042962135 @default.
• W4313263503 creator A5083715079 @default.
• W4313263503 date "2022-12-16" @default.
• W4313263503 modified "2023-10-15" @default.
• W4313263503 title "<scp>chronostar</scp> – II. Kinematic age and substructure of the Scorpius–Centaurus OB2 association" @default.
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