Spectroscopic orbits for three SB2s and one hierarchical triple using SALT data

TL;DR

This study confirms four spectroscopic binary candidates using SALT data, revealing detailed orbital characteristics of three SB2 systems and a hierarchical triple, with some candidates remaining unresolved.

Contribution

First detailed orbital solutions for three SB2 systems and a hierarchical triple using SALT spectroscopic data, expanding knowledge of binary star dynamics.

Findings

Three SB2 systems have circular orbits with periods under 10 days.

One hierarchical triple contains an inner eccentric binary and an outer eccentric orbit.

Two candidates remain unresolved due to insufficient data.

Abstract

We confirmed four spectroscopic binary candidates using new observations obtained with SALT. Three SB2 systems (HD 20784, HD 43519A, HD 62153A) exhibit circular orbits with periods shorter than 10 days, whereas one hierarchical triple system (HD 56024) contains a close binary with an inner eccentric orbit with a period of approximately 14 days, composed of nearly identical stellar components, and a rapidly rotating star on an outer eccentric orbit with a period of approximately 400 days. For two additional SB2 candidates (HD 198174 and HD 208433), our new observations do not allow us to derive reliable orbital solutions.