NOAO >   Observing Info >   Approved Programs >   2009A-0096

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Proposal Information for 2009A-0096


PI: Keivan G. Stassun, Vanderbilt University, keivan.stassun@vanderbilt.edu
Address: Physics Department, VU Station B 1807, Nashville, TN 37235, USA

CoI: Leslie Hebb, University of St. Andrews
CoI: Eric Stempels, University of St. Andrews
CoI: Andrew Collier-Cameron, University of St. Andrews

Title: Fundamental Properties of a New Low-Mass Pre-Main-Sequence Ecliping Binary System

Abstract: Studies of eclipsing binary stars are key to accurate, empirical measurements of the masses, radii, and temperatures of stars, which are necessary for understanding stellar evolution and for deriving well- calibrated theoretical models. However, only six pre-main-sequence eclipsing binaries with masses below 1 solar mass have so far been published. We have discovered TYC 7310-503-1 to be a low-mass, pre-main- sequence eclipsing binary in the Upper-Centaurus-Lupus star-forming region with component star masses of ~ 0.8 and ~ 0.5 M_\odot; this is one of the lowest mass young stellar eclipsing binaries yet found, and the first that is associated with a star-forming region other than Orion. Here we propose precise time-series photometry and spectroscopy of TYC 7310-503-1 which will permit the determination of accurate stellar masses and radii for this very young, very low-mass benchmark system.


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NOAO >   Observing Info >   Approved Programs >   2009A-0096

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