Spectroscopic orbits of subsystems in multiple stars. VIII

TL;DR

This paper reports 19 new spectroscopic orbits of inner subsystems in hierarchical multiple star systems, providing insights into their formation and evolution through high-resolution spectral data.

Contribution

It introduces new spectroscopic orbital data for 15 hierarchical stellar systems, expanding the understanding of their periods, eccentricities, and masses.

Findings

Most orbits have periods around a year.

Identification of systems with 2+2 architecture and low-mass secondaries.

Discovery of a planetary-type 3+1 hierarchy.

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, 9148, 12548, 21079, 24320, 27970, 34212, 56282, 57860, 76400, 76816, 81394, 96284, 100420, and HD 108938. Noteworthy systems are HIP 12548 and 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).