NOAO >   Observing Info >   Approved Programs >   2006A-0197

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Proposal Information for 2006A-0197


PI: Judith L. Provencal, University of Delaware, jlp@udel.edu
Address: Dept. of Physics and Astronomy, Sharp Laboratory, Newark, DE 19716, USA

CoI: Michael Montgomery, University of Texas
CoI: S.O. Kepler, SOAR Senior Resident Astronomer
CoI: Scot Kleinman, Subaru Telescope
CoI: Gerald Handler, University of Vienna
CoI: Harry Shipman, University of Delaware

Title: The Empirical Determination of Convection Parameters Across the DB Instability Strip

Abstract: Asteroseismology is a proven tool using pulsating stars to explore detailed conditions and their associated physics of stellar interiors. Recent work in non-linear pulsation theory has provided a new technique enabling direct measurements of the convective time scale (tau)_0, a temperature dependence parameter N, and, together with a stellar temperature determination, the classical convective efficiency parameter (mixing length ratio) (alpha). This proposal outlines a project to apply this technique to the high amplitude white dwarf pulsator GD358. The technique requires an extremely high signal to noise lightcurve supported by a global network (the Whole Earth Telescope, or WET) of time-series measurements providing precise oscillation frequencies and phases.


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NOAO >   Observing Info >   Approved Programs >   2006A-0197

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