Photocentric orbits from a direct combination of ground-based astrometry with Hipparcos II. Preliminary orbits for six astrometric binaries

Abstract

Based on a direct combination of the Hipparcos data with astrometric ground-based observational catalogues having epochs between 1938 and 1999 the preliminary orbits and component masses are calculated for 6 binaries with no previous orbit calculation: $\iota$~Vir (HIP~69701) with period of 55 years, photocentric semi-major axis of 200 mas, relative semi-major axis of 830 mas and a dwarf secondary of 0.6 solar masses; $\gamma$~UMa (HIP~58001) -- 20.5 years, 90 mas, 460 mas and a dwarf secondary of 0.8 solar masses; $\kappa$~Del (HIP~101916) -- 45 years, 100 mas, 520 mas and a dwarf secondary of 0.4 solar masses; 20~Oph (HIP~82369) -- 35.5 years, 140 mas, 460 mas and a dwarf secondary of 0.8 solar masses; $\mu$~Ser (HIP~77516) -- 36 years, 110 mas, 350 mas and a secondary of 2.3 solar masses; as well as a possible new component of Mizar~A ($\zeta$~UMa, HIP~65378) -- 36.5 years, 180 mas, 780 mas, 1.5 solar masses. The latter may be a pair of dwarfs.

6 figures, 5 tables

References in corpus (2)

• Pulkovo Compilation of Radial Velocities for 35495 Hipparcos Stars in a Common System
• Vertical distribution of Galactic disk stars IV - AMR and AVR from clump giants

Cited by in corpus (5)

• Massive heartbeat stars from TESS. I. TESS sectors 1-16
• Extrasolar planets and brown dwarfs around AF-type stars. IX. The HARPS southern sample
• Luminaries in the Sky: The TESS Legacy Sample of Bright Stars. I. Asteroseismic detections in naked-eye main-sequence and sub-giant solar-like oscillators
• Reaching the boundary between stellar kinematic groups and very wide binaries. IV. The widest Washington double star systems with rho > 1000 arcsec in Gaia DR3
• CoronaGraph Instrument Reference stars for Exoplanets (CorGI-REx) I. Preliminary Vetting and Implications for the Roman Coronagraph and Habitable Worlds Observatory