Spectroscopic characterization of nine binary star systems as well as HIP107136 and HIP107533

TL;DR

This study provides detailed radial velocity measurements and orbital solutions for nine binary star systems, while also confirming the constant velocities of two others and suggesting an additional companion in one system.

Contribution

It offers new precise radial velocity data and refined orbital parameters for multiple binary stars, and rules out binarity for two previously suspected systems.

Findings

Derived orbital solutions for 9 binary systems

Confirmed constant velocities for HIP107136 and HIP107533

Detected potential additional companion in HIP2225

Abstract

We present the results of our 2nd radial velocity monitoring campaign, carried out with the \'Echelle spectrograph FLECHAS at the University Observatory Jena in the course of the Gro{\ss}schwabhausen binary survey between December 2016 and June 2018. The aim of this project is to obtain precise radial velocity measurements for spectroscopic binary stars in order to redetermine, verify, improve and constrain their Keplerian orbital solutions. In this paper we describe the observations, data reduction and analysis and present the results of this project. In total, we have taken 721 RV measurements of 11 stars and derived well determined orbital solutions for 9 systems (7 single-, and 2 double-lined spectroscopic binaries) with periods in the range between 2 and 70 days. In addition, we could rule out the orbital solutions for the previously classified spectroscopic binary systems HIP107136 and HIP107533, whose radial velocities are found to be constant on the km/s-level over a span of time of more than 500 days. In the case of HIP2225 a significant change of its systematic velocity is detected between our individual observing epochs, indicating the presence of an additional companion, which is located on a wider orbit in this system.