NOAO >   Observing Info >   Approved Programs >   2010A-0138

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Proposal Information for 2010A-0138


PI: Lison Malo, University of Montreal, malo@astro.umontreal.ca
Address: Physic departement, C.P. 6128, Succursale Centre-Ville, Montreal, Quebec H3C 3J7, Canada

CoI: Rene Doyon, University of Montreal
CoI: Etienne Artigau, University of Montreal
CoI: David Lafreniere, University of Montreal

Title: Lithium test of Low-Mass Candidate members of Nearby Young Associations

Abstract: Young nearby associations provide a crucial sample of stars for studying the local star formation history, investigating the early phases of planet formation, and searching for exoplanets through direct imaging. While numerous new associations have been identified in the last decade, their members are mostly restricted to relatively massive F, G and K stars. Based on kinematics derived from the SIMP infrared proper motion survey, we have unveiled 130 highly probable young low- mass (>K5) members of the (beta) Pictoris moving group, and the Tucana-Horologium and AB Doradus associations. All stars show prominent H(alpha) and X-ray emission, but measuring their lithium absorption, along with their radial velocity, is required to confirm their membership and young age. We propose to use Hydra to measure the lithium absorption of 47 southern candidates visible this semester. Our program will significantly improve the census of (beta) Pic, Tuc-Hor and AB Dor in the low mass regime. Once their membership is confirmed, this new sample of young low-mass stars will provide ideal targets for direct imaging search of exoplanets.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2010A-0138

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