NOAO >   Observing Info >   Approved Programs >   2010A-0220

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Proposal Information for 2010A-0220


PI: Kaspar von Braun, California Institute of Technology, kaspar@caltech.edu
Address: NASA Exoplanet Science Institute, 770 South Wilson Ave, Pasadena, CA 91125, USA

CoI: Gail Schaefer, Georgia State University
CoI: Gerard van Belle, European Southern Observatory
CoI: David R. Ciardi, California Institute of Technology
CoI: Mercedes Lopez-Morales, Carnegie Institution of Washington

Title: Distances to Eclipsing M-Dwarf Binary Systems

Abstract: Between 2007 and 2009, we obtained trigonometric parallax measurements on five nearby M-dwarf eclipsing binary systems using the Fine Guidance Sensor (FGS) aboard the Hubble Space Telescope (HST) with the principal aim of constraining their luminosities (GO program 11213 -- PI: van Belle). The science driver of this project is the direct determination of fundamental astrophysical properties of these five systems to help solve the continuing disagreement between models and observations for low-mass stars. In this proposal, we request four nights at WIYN (HYDRA) and four nights at the KP-0.9m to gather vitally important auxiliary information for our HST data: spectral types, luminosity classes, and absolute magnitudes of the stars used as astrometric reference sources with respect to which the parallax angles of our targets were measured.


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 >   2010A-0220

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