Revisiting the Census and Age of the Beta Pictoris Moving Group in the Gaia Era
Date
2022
Authors
Contributor
Advisor
Department
Instructor
Depositor
Speaker
Researcher
Consultant
Interviewer
Narrator
Transcriber
Annotator
Journal Title
Journal ISSN
Volume Title
Publisher
Volume
Number/Issue
Starting Page
Ending Page
Alternative Title
Abstract
Determining the precise ages of young (~10 to few hundred Myr) kinematic ("moving") groups is important for placing star, protoplanetary disk, and planet observations on an evolutionary timeline. The nearby ~25 Myr-old Beta Pictoris Moving Group (BPMG) is an important benchmark for studying stars and planetary systems at the end of the primordial disk phase. Gaia DR3 astrometry combined with ground-based observations and more sophisticated stellar models permit a systematic re-evaluation of its membership and age. We combined Gaia astrometry with previous and new radial velocities to evaluate moving-group membership in a Bayesian framework. To minimize the effect of unresolved stellar multiplicity on age estimates, we identified and excluded multi-star systems using Gaia astrometry, ground-based adaptive optics imaging, and multi-epoch radial velocities, as well as the literature identifications. We estimated age using isochrone and lithium-depletion-boundary fitting with models that account for the effect of magnetic activity and spots on young, rapidly rotating stars. We report an age of 33(+9/-11) Myr to the BPMG based on isochrone fitting to the single-star and resolved-binary sample, which is older than, but within the uncertainties of, literature values.
Description
Keywords
Astronomy, evolutionary models, star-planet connections, stellar ages, stellar evolution, stellar multiplicity, young moving groups
Citation
Extent
56 pages
Format
Geographic Location
Time Period
Related To
Related To (URI)
Table of Contents
Rights
All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
Rights Holder
Local Contexts
Collections
Email libraryada-l@lists.hawaii.edu if you need this content in ADA-compliant format.