Speckle Interferometry of Nearby Multiple Stars. IV. Measurements in 2004 and New Orbits

TL;DR

This paper presents speckle interferometric measurements of 110 nearby multiple stars, including new binary discoveries and orbital parameter derivations, enhancing understanding of low-mass stellar systems.

Contribution

It provides new high-resolution measurements, discovers new binaries, and derives orbital parameters for specific systems, advancing observational data on nearby multiple stars.

Findings

Discovery of new binaries, including a symbiotic star and red dwarf pair.

Measurement of brightness ratios in multiple bands.

Derived orbital parameters for two binary systems.

Abstract

The results of speckle interferometric observations of 104 binary and 6 triple stars performed at the BTA 6 m telescope in 2004 October are presented. Nearby low-mass stars are mostly observed for the program, among which 59 there are new binaries recently discovered by the Hipparcos astrometric satellite. Concurrently with the diffraction-limited position measurements we obtained 154 brightness ratio measurements of binary and multiple star components in different bands of the visible spectrum. New, first-resolved binaries are the symbiotic star CH Cyg with a weak companion at 0.043'' separation and the pair of red dwarfs, GJ 913 = HIP 118212. In addition, we derived the orbital parameters for two interferometric systems: the CN-giant pair HD 210211 = HIP 109281 (P=10.7 yr) and the G2V-K2V binary GJ 9830 = HIP 116259 (P=15.7 yr).