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[11.01] A Search for Astrometric Companions to Southern Nearby Stars

J. L. Bartlett (UVa), P. A. Ianna (NSF), M. C. Begam (UVa)

A sample of stars from the University of Virginia southern hemisphere parallax program has been tested for possible astrometric perturbations due to low-mass companions. The data were taken from CCD parallax observations with the one-meter reflector at the Siding Spring Observatory, Coonabarabran, Australia. Following our standard central overlap solution for parallax and proper motion, the residuals were subjected to a time-series analysis using the Lomb periodogram method (Press et al. 1992). The selected objects are late M-type stars with large parallaxes, mostly within 10 parsecs, not known to be binaries. They include LHS 288, LHS 337, LHS 532, LHS 1134, LHS 1565, LHS 2739, LHS 2813, and LHS 3064.

We acknowledge support from NSF grant AST 98-20711 and from the Research School of Astronomy and Astrophysics, Australian National University.

The author(s) of this abstract have provided an email address for comments about the abstract: jlb2j@virginia.edu

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Bulletin of the American Astronomical Society, 34
© 2002. The American Astronomical Soceity.