Speckle Interferometry at SOAR in 2020

TL;DR

This paper presents speckle interferometric observations at SOAR in 2020, resolving new binary pairs and monitoring orbital motions, contributing valuable data to the study of nearby and young stellar systems.

Contribution

First-time resolution of 59 new binary pairs and extensive observational data supporting binary star orbital studies.

Findings

Resolved 59 new binary pairs or subsystems.

Collected 1735 measurements of stellar pairs.

Monitored orbital motion in various stellar populations.

Abstract

The results of speckle interferometric observations at the 4.1 m Southern Astrophysical Research Telescope (SOAR) in 2020, as well as earlier unpublished data, are given, totaling 1735 measurements of 1288 resolved pairs and non-resolutions of 1177 targets. We resolved for the first time 59 new pairs or subsystems in known binaries, mostly among nearby dwarf stars. This work continues our long-term speckle program. Its main goal is to monitor orbital motion of close binaries, including members of high-order hierarchies and Hipparcos pairs in the solar neighborhood. We also report observations of 892 members of young moving groups and associations, where we resolved 103 new pairs.