NOAO >   Observing Info >   Approved Programs >   2011B-0228

Small NOAO Logo

Proposal Information for 2011B-0228


PI: Leslie Hebb, Vanderbilt University, leslie.hebb@vanderbilt.edu
Address: Physics Department, 6301 Stevenson Center, Nashville, TN 37235, USA

CoI: Keivan Stassun, Vanderbilt University
CoI: Don Pollacco, Queens University Belfast
CoI: Yilen Gomez Maqueo Chew, Queens University Belfast
CoI: Andrew Collier-Cameron, University of St Andrews

Title: Defining the M dwarf Mass-Radius relation as a function of activity and metallicity

Abstract: Recently, it has been established that there is a discrepancy between measured radii of M dwarf stars and their corresponding theoretical predictions. The cause of this discrepancy is likely due to magnetic activity and/or metallicity effects. We have initiated a large program with the goal of establishing in detail how M dwarf radii depend on activity and metallicity. We will empirically determine the mass- radius relationship of M dwarf stars with large number statistics over the entire M dwarf range (0.08 < M < 0.55 M_\odot) using a sample of F/G/K+M dwarf eclipsing binaries for which metallicity and activity measures can be determined. Specifically, we propose to obtain 1) a single high signal-to-noise, high resolution spectrum of 10 of our northern hemisphere targets in order to derive the effective temperatures and metallicities via spectral synthesis of the F/G/K primary stars, 2) multiple H-band spectra to derive radial velocity curves for systems that still lack these data, and 3) multi-band eclipse light curves of our southern hemisphere objects needed to derive accurate radii.


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-0228

noaoprop-help@noao.edu

Small NOAO Logo