Speckle Interferometry of Nearby Multiple Stars: 2007-2019 Positional Measurements and Orbits of Eight Objects

TL;DR

This study presents new speckle interferometric measurements of eight nearby low-mass multiple star systems, improving or deriving their orbital parameters and mass estimates for the first time, based on data collected over 12 years.

Contribution

It provides updated and new orbital solutions for eight low-mass multiple star systems using long-term speckle interferometry data.

Findings

Improved orbital solutions for six systems.

First orbital solutions for HIP 14524 and HIP 60444.

Mass sums calculated and compared with previous estimates.

Abstract

The orbits of 8 systems with low-mass components (HIP 14524, HIP 16025, HIP 28671, HIP 46199, HIP 47791, HIP 60444, HIP 61100 and HIP 73085) are presented. Speckle interferometric data were obtained at the 6 m Big Alt-azimuth Special Astrophysical Observatory of the Russian Academy of Sciences (BTA SAO RAS) from 2007 to 2019. New data, together with measures already in the literature, made it possible to improve upon previous orbital solutions in six cases and to construct orbits for the first time in the two remaining cases (HIP 14524 and HIP 60444). Mass sums are obtained using both Hipparcos and Gaia parallaxes, and a comparison with previously published values is made. Using the Worley & Heintz criteria, the classiffcation of the orbits constructed is carried out.