NOAO >   Observing Info >   Approved Programs >   2010B-0164

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Proposal Information for 2010B-0164


PI: Scott Fleming, University of Florida, scfleming@astro.ufl.edu
Address: Astronomy Department, 211 Bryant Space Science Center P.O. Box 112055, Gainesville, FL 32611-2055, USA

CoI: Jian Ge, University of Florida
CoI: Leslie Hebb, Vanderbilt University
CoI: Trey Mack, Vanderbilt University
CoI: Martin Paegert, Vanderbilt University
CoI: Joshua Pepper, Vanderbilt University
CoI: Keivan Stassun, Vanderbilt University

Title: More BiRDS: The Mass:Radius Relationship Of Long-Period Eclipsing Binaries

Abstract: BiRDS (\underlineBinary \underlineResearch with \underlineDedicated \underlineSpectroscopy) is a project dedicated towards utilizing Echelle spectroscopy to study binary stars found in extrasolar planet surveys. One of the primary research areas of BiRDS is the mass-radius relationship of K and M dwarfs. Observations have shown that the radii of K and M stars in binaries are larger than models predict by as much as 10-30%. This may be due to tidal ``pumping'' of the stellar radii in short-period, tidally locked systems. We propose to perform spectroscopic observations of ~15 eclipsing binaries (EBs) with orbital periods 5 < P < 15 days. Such EBs have semi-major axes out to distances where tides have less of an effect on the companion's rotation rate, yet precious few of these relatively long-period EBs have been measured with high precision using \emphboth photometry and spectroscopy. These data will fill in a previously under-explored region of semimajor axis space, and allow for detailed exploration of the mass-radius relationship in systems for which tidal effects are not expected to inflate the stellar radii.


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