Chronostar-II. Kinematic age and substructure of the Scorpius-Centaurus OB2 association
Article
Zerjal, Maruša, Ireland, Michael J., Crundall, Timothy D., Krumholz, Mark R. and Rains, Adam D.. 2023. "Chronostar-II. Kinematic age and substructure of the Scorpius-Centaurus OB2 association." Monthly Notices of the Royal Astronomical Society. 519 (3), pp. 3992-4009. https://doi.org/10.1093/mnras/stac3693
Article Title | Chronostar-II. Kinematic age and substructure of the Scorpius-Centaurus OB2 association |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Zerjal, Maruša, Ireland, Michael J., Crundall, Timothy D., Krumholz, Mark R. and Rains, Adam D. |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 519 (3), pp. 3992-4009 |
Number of Pages | 18 |
Year | 2023 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stac3693 |
Web Address (URL) | https://academic.oup.com/mnras/article/519/3/3992/6918849 |
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. |
Keywords | Galaxy: kinematics and dynamics; stars: kinematics and dynamics; Galaxy: open clusters and associations: individual: Scorpiu; Centaurus association |
ANZSRC Field of Research 2020 | 529999. Other psychology not elsewhere classified |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2022 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | Centre for Astrophysics |
Australian National University | |
Instituto de Astrof´ısica de Canarias (IAC), Spain | |
University of La Laguna, Spain | |
University of Cologne, Germany |
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