Spectroscopic orbits of nearby stars^⋆

¹ Vilnius University Observatory, Saulėtekio al. 3, 10257 Vilnius, Lithuania
e-mail: julius.sperauskas@ff.vu.lt
² Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile
e-mail: atokovinin@ctio.noao.edu

Received: 22 February 2019
Accepted: 22 March 2019

Abstract

Aims. We observed stars with variable radial velocities to determine their spectroscopic orbits.

Methods. Velocities are presented of 132 targets taken over a time span reaching 30 years. These were measured with the correlation radial velocity spectrometers (1917 velocities) and the new VUES echelle spectrograph (627 velocities), with a typical accuracy of 0.5 and 0.2 km s⁻¹, respectively.

Results. We derived spectroscopic orbits of 57 stars (including 53 first-time orbits), mostly nearby dwarfs of spectral types K and M, with some being HIPPARCOS astrometric binaries. Their periods range from 2.2 days to 14 years. Comments on individual objects are provided. Many stars belong to hierarchical systems containing three or more components, including 20 new hierarchies resulting from this project. The preliminary orbit of the young star HIP 47110B has a large eccentricity e = 0.47 despite having a short period of 4.4 d; it could still be circularizing.

Conclusions. Our results enrich the data on nearby stars and contribute to a better definition of the multiplicity statistics.