Revisiting the Census and Age of the Beta Pictoris Moving Group in the Gaia Era

Simple item page
dc.contributor.advisorGaidos, Eric
dc.contributor.authorLee, Rena Aerey
dc.contributor.departmentEarth and Planetary Sciences
dc.date.accessioned2023-02-23T23:57:14Z
dc.date.available2023-02-23T23:57:14Z
dc.date.issued2022
dc.description.abstractDetermining 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.
dc.description.degreeM.S.
dc.identifier.urihttps://hdl.handle.net/10125/104664
dc.languageeng
dc.publisherUniversity of Hawaii at Manoa
dc.subjectStars--Age
dc.subjectGlobal Astrometric Interferometer for Astrophysics
dc.titleRevisiting the Census and Age of the Beta Pictoris Moving Group in the Gaia Era
dc.typeThesis
dc.type.dcmiText
local.identifier.alturihttp://dissertations.umi.com/hawii:11607

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Lee_hawii_0085O_11607.pdf
Size:
6.45 MB
Format:
Adobe Portable Document Format
Download

Collections

M.S. - Earth and Planetary Sciences