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K. Callerame, I.R. Seitenzahl, E.M. Green, B. White, E. Hyde, G. Milone (Steward Observatory, University of Arizona)
Low amplitude variations in the light curves of subdwarf B (sdB) stars can provide powerful evidence concerning the nature and evolutionary history of interacting binary systems, via eclipses, reflection effects, or ellipsoidal variations. Variable amplitudes due to multiple mode, non-radial pulsations can also provide information about the interior structure of these He core-burning stars. We discuss an ongoing CCD monitoring program to obtain multiple, precise light curves for sdB stars, relative to other stars in the same frames. The results from our first two years of monitoring include 1) eclipses of two sdB stars by white dwarf companions, 2) an investigation of the amplitude of reflection effects in short period, non-eclipsing sdB binaries, and 3) discovery of a new class of long period sdB pulsators. This survey has been supported by NSF grants AST-9731655 and AST-0098699.
The author(s) of this abstract have provided an email address for comments about the abstract: bgreen@as.arizona.edu
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Bulletin of the American Astronomical Society, 34
© 2002. The American Astronomical Soceity.