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Unconstrained Astrometric Orbits for Hipparcos Stars with Stochastic Solutions

Makarov, V. V.; Goldin, A.

A considerable number of astrometric binaries whose positions on the sky do not obey the standard model of mean position, parallax, and linear proper motion were observed by the Hipparcos satellite. Some of them remain undiscovered, and their observational data have not been properly processed with the more adequate astrometric model that includes…

The Secondaries of Solar-Type Primaries. I. The Radial Velocities

Abt, Helmut A.; Willmarth, Daryl

We studied for duplicity the 167 F7-G8 IV or V primaries within 25 pc of the Sun according to their Hipparcos parallaxes and between declinations of -30° and +75°. We obtained an average of 13 coudé radial velocities with an accuracy of +/-0.10 km s^-1. Combining these measures with published data, we obtained 39 single-lined and 12 doub…