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R. Olling (USNO/USRA)
We present a new analysis of the astrometric and photometric errors reported in the Hipparcos and Tycho-2 catalogs. We develop new criteria to identify likely binary systems. These systems are probably small delta-m systems that are just unresolved (d<0.1") by Hipparcos.
The astrometry of several astrophysically interesting groups of stars such as Cepheids, red clump stars, and potential SIM/TPF targets are re-analyzed.
The author(s) of this abstract have provided an email address for comments about the abstract: olling@usno.navy.mil
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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.