Spectroscopic orbits of subsystems in multiple stars. IV. Double-lined pairs

Abstract

Spectroscopic orbits are computed for inner pairs in 9 hierarchical multiple systems (HIP 19639, 60845, 75663, 76816, 78163, 78416, 80448, 84789, and HD 105080) and for one simple binary HIP 61840. All subsystems are double-lined, and their periods range from 2.27 to 30.4 days. Five spectroscopic binaries are twins with equal masses. Each hierarchical system is discussed individually, providing estimates of outer periods, masses, orbital inclination, and axial rotation. For systems with three resolved visual components (HIP 60845 and 80448), the outer and inner visual orbits are determined, complementing the description of their architecture. The radial velocities of HIP 75663A, 76816B, and 78163B are found to be variable with long periods, implying that these hierarchies are 2+2 quadruples. The period-eccentricity relation for spectroscopic subsystems is discussed.

Accepted by AJ. 12 pages, 12 figures

References in corpus (5)

• The Gaia mission
• The Dartmouth Stellar Evolution Database
• The Updated Multiple Star Catalog
• Speckle interferometry at SOAR in 2016 and 2017
• Spectroscopic orbits of subsystems in multiple stars. III

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• A census of main-sequence interactions in the Multiple Star Catalog
• Search for Stellar Flybys in the Sco-Cen OB Association with the Gaia DR2