NOAO >   Observing Info >   Approved Programs >   2011B-0302

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Proposal Information for 2011B-0302


PI: Lison Malo, Universite de Montreal, malo@astro.umontreal.ca
Address: Departement de Physique, C.P. 6128, Succursale Centre-Ville, Montreal, Quebec H3C 3J7, Canada

CoI: Rene Doyon, Universite de Montreal
CoI: Etienne Artigau, Universite de Montreal
CoI: David Lafreniere, Universite de Montreal
CoI: Marie-Eve Naud, Universite de Montreal

Title: Age-Dating and Radial Velocity of Low-Mass Candidate members of Nearby Young Kinematic Groups

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 with NICI and GPI. While numerous new associations have been identified in the last decade, their members are mostly restricted to relatively massive (F,G,K) stars. Through a novel statistical analysis, we have identified 145 highly probable young low-mass members of Beta Pictoris, and AB Doradus moving groups and Tucana-Horologium association. A confirmation of their membership and their young age require, however, measurements of their radial velocity and several spectroscopic age indicators. That is what we propose to do with CHIRON for 15 southern candidates. These spectroscopic youth indicators are molecular absorption bands ratio (CaH), lithium absorption, Halpha and HeI line profiles (accretion) and rotation. Our program will significantly improve (double) the census of BetaPic, Tuc/Hor and ABDor members. Previous NOAO time allocation has already confirmed 44 late- type members of these associations.


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 >   2011B-0302

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