Spectroscopic Orbits of Subsystems in Multiple Stars. IX

Tokovinin, Andreï

doi:10.3847/1538-3881/acbe42

Cited by 3 publications

(1 citation statement)

References 31 publications

(41 reference statements)

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“…Their architecture is relevant to star formation, while dynamical evolution of these hierarchies increases chances of stellar interactions and mergers (Tokovinin 2021a). Orbital motions of many triple systems are monitored at SOAR, and these data are used for orbit determinations and dynamical analysis (Tokovinin & Latham 2020;Tokovinin 2021bTokovinin , 2023aTokovinin , 2023b. We reobserved some tight inner subsystems of hierarchies discovered at SOAR in 2021-2022 by Powell et al (2023, label POW, tag P) and hierarchies within 100 pc (Tokovinin 2023c, label GKM, tag T); see Section 3.5.…”

Section: Observing Programsmentioning

confidence: 99%

Speckle Interferometry at SOAR Telescope in 2023

Tokovinin,

Mason,

Mendez

et al. 2024

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Results of the speckle-interferometry observations at the 4.1 m Southern Astrophysical Research Telescope obtained during 2023 are presented: 1913 measurements of 1533 resolved pairs or subsystems (median separation 0.″16) and nonresolutions of 552 targets; 42 pairs are resolved here for the first time. This work continues our long-term effort to monitor orbital motion in close binaries and hierarchical systems. A large number (147) of orbits have been determined for the first time or updated using these measurements. Complementarity of this program with the Gaia mission is highlighted.

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Section: Observing Programsmentioning

confidence: 99%

Speckle Interferometry at SOAR Telescope in 2023

Tokovinin,

Mason,

Mendez

et al. 2024

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Spectroscopic Orbits of Subsystems in Multiple Stars. X (Summary)

Tokovinin

2023

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Results of a large program of spectroscopic monitoring of nearby solar-type stellar hierarchical systems using the CHIRON echelle spectrograph at the 1.5 m telescope are summarized. Ten papers of this series contain 102 spectroscopic orbits and substantially contribute to the knowledge of periods and eccentricties, providing input for the study of their formation and early evolution. Radial velocities of an additional 91 targets without CHIRON orbits (members of wide physical pairs) are published here. Our results are compared to the recent Gaia nonsingle star (NSS) catalog, revealing its strengths and weaknesses. The NSS provides orbital periods for 31 objects of the CHIRON sample (about one third). Of the 22 spectroscopic NSS orbits in common, 14 are in good agreement with CHIRON, the rest have reduced velocity amplitudes or other problems. Hence ground-based monitoring gives, so far, a more accurate and complete picture of nearby hierarchies than Gaia. The distribution of inner periods in hierarchical systems is nonmonotonic, showing a shallow minimum in the 30–100 days bin and a strong excess at shorter periods, compared to the smooth distribution of simple binaries in the field. The period-eccentricity diagram of inner subsystems updated by this survey, recent literature, and Gaia, displays an interesting structure.

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Orbits of Binary Stars: from Visual Measures to Speckle Interferometry

Tokovinin

2024

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Knowledge of the orbits of visual binary stars has always been one of the fundamentals of astronomy. Based historically on the visual measures, nowadays the orbits rely more (or exclusively) on the accurate speckle data. This prompts reconsideration of the methods of orbit calculation, undertaken here and illustrated by 20 examples, from accurate to drastically revised and tentative orbits. Good understanding and critical assessment of the input data is a key requirement, especially concerning visual measures. Combination of visual and speckle data is still needed for long-period binaries, but the relative weights must match their respective errors. When the orbit can be fully constrained only by accurate speckle data, the old measures should be ignored. Orbits can be classified into three grades: (A) fully constrained, (B) semiconstrained, and (C) preliminary or tentative. Typical use cases of visual orbits are listed. Accurate parallaxes from Gaia, together with the orbits, will greatly expand the data on stellar masses. Continued speckle monitoring will be an essential complement to Gaia, but the vast amount of new pairs will restrict future work on orbits to the most interesting or relevant objects.

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Spectroscopic Orbits of Subsystems in Multiple Stars. IX

Cited by 3 publications

References 31 publications

Speckle Interferometry at SOAR Telescope in 2023

Speckle Interferometry at SOAR Telescope in 2023

Spectroscopic Orbits of Subsystems in Multiple Stars. X (Summary)

Orbits of Binary Stars: from Visual Measures to Speckle Interferometry

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