Improved orbits and parallaxes for eight visual binaries with unrealistic previous masses using the Hipparcos parallax

• Published in: Monthly notices of the Royal Astronomical Society Vol. 459; no. 2; pp. 1580 - 1585
• Main Authors: Docobo, J. A., Tamazian, V. S., Malkov, O. Yu, Campo, P. P., Chulkov, D. A.
• Format: Journal Article
• Language: English
• Published: London Oxford University Press 21-06-2016
• Subjects: Astrophysics; Binary stars; Estimates; Luminosity; Mathematical analysis; Orbits; Parallax; Star & galaxy formation; Visual; binaries: visual; astrometry
• ISSN: 0035-8711; 1365-2966
• DOI: 10.1093/mnras/stw709

Improved orbits are presented for the visual binaries WDS 02366+1227, WDS 02434-6643, WDS 03244-1539, WDS 08507+1800, WDS 09128-6055, WDS 11532-1540, WDS 17375+2419, and WDS 22408-0333. The latest orbits for these binaries were demonstrating a great inconsistency between the systemic mass obtained through Kepler's Third Law and that calculated as a sum of their components’ mass through standard mass–luminosity and mass–spectrum relationships. Our improvement allowed us to obtain consistent systemic masses for WDS 02434-6643 and WDS 09128-6055 without a need for changing the Hipparcos parallax. For the remaining six pairs, we suggest the use of their dynamical parallax as a reliable distance estimate unless more precise parallax is reported. Astrophysical and dynamical properties of individual objects are discussed.