Type: Poster
Session: Posters (Monday & Tuesday)
Author: Sofia Lawsky

Abstract: The Pleiades is one of our most precious benchmarks for stellar  astrophysics, and a common origin for it and for the moving group AB Dor  has long been suspected. Theia 301 is a new stellar structure, discovered  with Gaia, which appears to be comoving with AB Dor and the Pleiades:  members of AB Dor and of Theia 301 are spread across what may be a tidal  tail trailing the Pleiades. We have taken a fresh look at the kinematics  of these three structures using Gaia DR3 and CHIRON radial velocities of  members of AB Dor and Theia 301; at their ages as revealed by their  color-magnitude diagrams, rotation periods from TESS, and lithium  abundances from our CHIRON spectra; and at their detailed elemental  abundances from the spectra of solar-type members to assess their chemical  similarity. Uniting the Pleiades with AB Dor and Theia 301 would provide  an exciting new laboratory for studying how stellar structures form and  dissolve in the Milky Way, and how differing cluster environments impact  stellar evolution. This work is representative of the investigations that  LSST astrometry and light curves will enable for even fainter members of  these and other stellar clusters--and also of the follow-up that will be required to make the most of these data.