2016/04/21 by Andrei Tokovinin · 18 citations
Physics and Astronomy · #Astro and Planetary Science #Astronomy and Astrophysical Research #Binary number #Binary star #Orbit (dynamics) #Orbital period #Parallax #Primary (astronomy) #Stars #Stellar, planetary, and galactic studies #Visual binary #astro-ph.SR
paper · pdf · doi:10.3847/0004-6256/152/1/10
published in The Astronomical Journal 152(1), 10 (Institute of Physics) · Accepted by Astronomical Journal. 12 pages, 10 figures, 6 tables
arxiv created 2016/04/21 · openalex publication_date 2016/06/20 · openalex created_date 2016/06/24 · arxiv updated 2016/06/29 · openalex updated_date 2026/08/05
ABSTRACT Seven spectroscopic orbits in nearby solar-type multiple stars are presented. The primary of the chromospherically active star HIP 9642 is a 4.8 day double-lined pair; the outer 420 year visual orbit is updated, but remains poorly constrained. HIP 12780 is a quadruple system consisting of the resolved 6.7 year pair FIN 379 Aa,Ab, for which the combined orbit, masses, and orbital parallax are determined here, and the single-lined binary Ba,Bb with a period of 27.8 days. HIP 28790 is a young quintuple system composed of two close binaries, Aa,Ab and Ba,Bb, with periods of 221 and 13 days, respectively, and a single distant component C. Its subsystem Ba,Bb is peculiar, having a spectroscopic mass ratio of 0.89 but a magnitude difference of ∼2.2 mag. HIP 64478 also contains five stars: the A-component is a 29 year visual pair with a previously known 4 day twin subsystem, while the B-component is a contact binary with a period of 5.8 hr, seen nearly pole-on.