NOAO >   Observing Info >   Approved Programs >   2005A-0524

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Proposal Information for 2005A-0524


PI: Terry D. Oswalt, Florida Tech, toswalt@fit.edu
Address: Physics Department, 150 W. University Blvd., Melbourne, FL 32901, USA

CoI: Merissa Rudkin, Florida Tech
CoI: Nigel Hambly, Edinburgh University
CoI: Nicole Silvestri, U. Washington
CoI: Suzanne Hawley, U. Washington

Title: Calibrating the Chromospheric Activity - Age Relation for Low-Mass Main Sequence Stars

Abstract: We propose to investigate the chromospheric activity (CA) vs. age relation among low mass main sequence (MS) stars using noninteracting binaries that contain a white dwarf (WD) star with a distant cool MS companion. The cooling ages of the WD components, and therefore the ages of their coeval MS companions, span the entire history of the local Galactic disk (~10 Gyr). This age range overlaps with and extends by more than a factor of two the CA-age calibration possible by other approaches. The project will help resolve strong systematic differences between MS age estimates derived from open cluster membership, rotation rates, Li abundance and UV/X-ray fluxes. It will also explore the transition region in early M stars where the canonical self-sustaining dynamo mechanism gives way to other processes that may excite CA. In addition, it will be one of the first investigations of CA vs. age in low metallicity (i.e. halo) stars.


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 >   2005A-0524

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