# Spectroscopic orbits of nearby stars

## TL;DR

This study presents spectroscopic orbits for 57 nearby stars, including 53 new orbits, derived from 1320 radial velocity measurements over 30 years, enhancing understanding of stellar multiplicity and system dynamics.

## Contribution

The paper provides 53 first-time spectroscopic orbits and reveals new hierarchical systems among nearby stars, expanding data on stellar multiplicity.

## Key findings

- Derived 57 spectroscopic orbits, including 53 first-time orbits.
- Identified 20 new hierarchical stellar systems.
- Provided detailed orbital parameters for stars with periods from 2.2 days to 14 years.

## Abstract

We observed stars with variable radial velocities to determine their spectroscopic orbits. Velocities of 132 targets taken over a time span reaching 30 years are presented. They were measured with the correlation radial velocity spectrometers (1913 velocities) and the new VUES echelle spectrograph (632 velocities), with typical accuracy of 0.5 and 0.2 km/s, respectively. We derived spectroscopic orbits of 57 stars (including 53 first-time orbits), mostly nearby dwarfs of spectral types K and M. Their periods range from 2.2 days to 14 years, some of those are Hipparcos astrometric binaries. 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 short period of 4.4 d; it could be still circularizing. Our results enrich the data on nearby stars and contribute to a better definition of the multiplicity statistics.