NOAO > Observing Info > Approved Programs > 2008A-0110
|
NOAO > Observing Info > Approved Programs > 2008A-0110 |
|
PI: Judi Provencal, University of Delaware, jlp@udel.edu
Address: Department of Physics and Astronomy, 223 Sharp Laboratory, Newark, DE 19716, USA
CoI: Michael Montgomery, University of Texas
CoI: Susan Thompson, University of Delaware
CoI: S. O. Kepler, Universidade Federal do Rio Grande Do Sul
CoI: Mike Reed, Southwestern Missouri State
Title: Whole Earth Telescope observations to measure the convective properties of EC14012-1446
Abstract:
Through a coordinated network of world-wide observatories, we
propose to take advantage of recent advances in pulsation theory to
empirically determine the physical properties of convection in a
pulsating hydrogen atmosphere white dwarf star (DAV). We will use
observed nonlinear pulse shapes of the pulsating white dwarf EC14012-
1446, combined with accurate frequency, amplitude, and phase
information, to directly probe the nature of its convection zone. While
this global effort is in place, we will utilize the early parts of our
nights to gain precise period measurements of the hot pulsating white
dwarf star PG1159-035. This data, combined with previous observations,
will allow us to measure the first and second derivative of the period
as a function of time, directly measuring the star's cooling rate as
well as changes in its rotation rate and contraction rate.
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 > 2008A-0110 |
|