Spectroscopic Orbits of Subsystems in Multiple Stars. VIII.

Abstract

Abstract Periods, eccentricities, and masses in hierarchical stellar systems inform us on the formation and early evolution of these fascinating objects. To complement the multiplicity statistics of nearby solar-type stars, 19 new spectroscopic orbits of inner subsystems in 15 hierarchies (10 triples and 5 quadruples) are determined based on high-resolution echelle spectra collected during several years. While previous papers of this series contained mostly short-period orbits, here most periods are on the order of a year. The main components of these hierarchies are HIP 7852, HIP 9148, HIP 12548, HIP 21079, HIP 24320, HIP 27970, HIP 34212, HIP 56282, HIP 57860, HIP 76400, HIP 76816, HIP 81394, HIP 96284, HIP 100420, and HD 108938. Noteworthy systems are HIP 12548 and HIP 24230 (hierarchies of 2+2 architecture with low-mass spectroscopic secondaries), HIP 56282 (a planetary-type 3+1 hierarchy), and HIP 27970 (a compact triple with periods of 15 and 1049 days).