Orbits of subsystems in four hierarchical multiple stars
arXiv:1604.06399 · doi:10.3847/0004-6256/152/1/10
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-yr visual orbit is updated, but remains poorly constrained. HIP 12780 is a quadruple system consisting of the resolved 6.7-yr 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 the 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 hours, seen nearly pole-on.
Accepted by Astronomical Journal. 12 pages, 10 figures, 6 tables
References in corpus (5)
- The Dartmouth Stellar Evolution Database
- Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Southern Sample
- Extrasolar planets and brown dwarfs around A-F type stars VI. High precision RV survey of early type dwarfs with HARPS
- Luminosity function of contact binaries based on the ASAS survey
- The doubly eclipsing quintuple low-mass star system 1SWASP J093010.78+533859.5
Cited by in corpus (9)
- Ten years of speckle interferometry at SOAR
- Spectroscopic orbits of subsystems in multiple stars. VI
- Spectroscopic orbits of subsystems in multiple stars. III
- A Quintuple Star System Containing Two Eclipsing Binaries
- Spectroscopic Orbits of Subsystems in Multiple Stars. X (Summary)
- Spectroscopic orbits of subsystems in multiple stars. V
- Spectroscopic orbits of subsystems in multiple stars. VIII
- Spectroscopic orbits of subsystems in multiple stars. IV. Double-lined pairs
- Orbital parallax of binary systems compared to GAIA DR3 and the parallax zero-point offset at bright magnitudes