Speckle Interferometry at SOAR in 2019

The results of speckle-interferometric observations at the 4.1 m Southern Astrophysical Research Telescope in 2019 are given, totaling 2555 measurements of 1972 resolved pairs with separations from 15 mas (median 0 21) and magnitude difference up to 6 mag, and non-resolutions of 684 targets. We reso...

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Bibliographic Details
Published in:The Astronomical journal 2020-07, Vol.160 (1), p.7
Main Authors: Tokovinin, Andrei, Mason, Brian D., Mendez, Rene A., Costa, Edgardo, Horch, Elliott P.
Format: Article
Language:English
Subjects:
Astronomy
Astrophysical research
Binary stars
Hierarchies
Interferometric observation
Interferometry
Multiple stars
Orbits
Solar neighborhood
Speckle interferometry
Subsystems
Visual binary stars
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Summary:The results of speckle-interferometric observations at the 4.1 m Southern Astrophysical Research Telescope in 2019 are given, totaling 2555 measurements of 1972 resolved pairs with separations from 15 mas (median 0 21) and magnitude difference up to 6 mag, and non-resolutions of 684 targets. We resolved for the first time 90 new pairs or subsystems in known binaries. 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 give a list of 127 orbits computed using our latest measurements. Their quality varies from excellent (25 orbits of grades 1 and 2) to provisional (47 orbits of grades 4 and 5).
ISSN:0004-6256
1538-3881
DOI:10.3847/1538-3881/ab91c1