Dynamical age of the Tucana-Horologium young stellar association

Author(s): Phillip A.B. Galli, Núria Miret-Roig, Hervé Bouy, Javier Olivares, David Barrado
Abstract: The Tucana-Horologium association is one of the closest young stellar groups to the Sun and despite the close proximity its age is still debated in the literature. We take advantage of the state-of-the-art astrometry delivered by the third data release of the Gaia space mission combined with precise radial velocity measurements obtained from high-resolution spectroscopy to investigate the dynamical age of the association. We perform an extensive traceback analysis using a combination of different samples of cluster members, metrics to evaluate the minimum size of the association in the past and models for the galactic potential to integrate the stellar orbits back in time. The dynamical age of 38.5⁺₋₈¹₀⁶ Myr that we derive in this paper is consistent with the various age estimates obtained from isochrone fitting in the literature (30–50 Myr) and reconciles, for the first time, the dynamical age of the Tucana-Horologium association with the age obtained from lithium depletion (∼40 Myr). Our results are independent from stellar models and represent one more step towards constructing a self-consistent age scale for the young stellar groups of the Solar neighbourhood based on the 3D space motion of the stars.
Organisation(s): Department of Astrophysics
External organisation(s): Universidade Cruzeiro do Sul, Laboratoire d'Astrophysique de Bordeaux, Universidad Nacional de Educacion a Distancia (UNED), Centro de Astrobiología (CSIC-INTA)
Journal: Monthly Notices of the Royal Astronomical Society
Volume: 520
Pages: 6245-6255
No. of pages: 11
ISSN: 0035-8711
DOI: https://doi.org/10.1093/mnras/stad520
Publication date: 04-2023
Peer reviewed: Yes
Austrian Fields of Science 2012: 103003 Astronomy, 103004 Astrophysics
Keywords
ASJC Scopus subject areas: Astronomy and Astrophysics, Space and Planetary Science
Portal url: https://ucrisportal.univie.ac.at/en/publications/a9204995-0dab-497b-981f-112b050830fe

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