NOAO >   Observing Info >   Approved Programs >   2004B-0469

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Proposal Information for 2004B-0469


PI: Maja Vuckovic, Iowa State University, maja@iastate.edu
Address: Dept. of Physics and Astronomy, 89 Physics, Ames, IA 50011, USA

CoI: Reed L. Riddle, Iowa State University
CoI: Steven Kawaler, Iowa State University
CoI: Michael Reed, Southwest Missouri State University

Title: Whole Earth Telescope observations of PG 0014+067 - A key pulsating subdwarf B star

Abstract: The pulsating sdB star PG 0014+067 stands out as one of the richest sdB pulsators. This mode density poses a fundamental challenge to understanding the pulsations of these stars, as there are not enough radial and nonradial modes with low \ell to account for them without rotational splitting. One proposed solution requires high degree (\ell=3, 4) modes, while another invokes evolutionary models of sdB stars that have rapid internal rotation. The only available observations of PG 0014+067 are single site data from CFHT (5 nightly runs in 1998, averaging less than two hours each). These data show that the oscillations are indeed complex, but the observations suffer from severe 1 cycle/day aliases. We will use NOAO facilities within an extended network (the Whole Earth Telescope) to determine, unambiguously, the star's oscillation frequencies. Only then can we critically examine competing theoretical models for these stars with minimal concern for diurnal aliasing. The rich mode spectrum of PG 0014+067 will provide valuable input into modeling the structure of this important class of evolved stars.


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