Astrometric mass ratios for three spectroscopic binaries

Abstract

The orbits of five single-lined spectroscopic binaries have recently been determined. We now use astrometric measurements that were collected with the Hipparcos satellite to constrain the systems' mass ratios and secondary masses. The barycentric astrometric orbits of three binary systems, HD 140667, HD 158222, and HD 217924, are fully determined and precise estimates of their mass ratios are obtained. Follow-up of these systems with infrared spectroscopy could yield model-independent dynamical masses for all components.

4 pages, 4 figures. Research note accepted for publication in Astronomy and Astrophysics

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• Binary mass ratios: system mass not primary mass
• HD 5388 b is a 69 M_Jup companion instead of a planet

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