THE BINARY SYSTEM Σ2173

New high-dispersion spectroscopic observations of the visual binary Σ2173 are combined with earlier ones obtained during passage through the opposite node, and with the available visual and interferometric observations, to determine the orbital elements completely. We find P =46y.43, T=1962.52, Ω =...

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Veröffentlicht in:Publications of the Astronomical Society of the Pacific 1991-03, Vol.103 (661), p.294-299
Hauptverfasser: BATTEN, A. H., FLETCHER, J. M., HILL, G., LU, WENXIAN, MORBEY, C. L.
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container_issue 661
container_start_page 294
container_title Publications of the Astronomical Society of the Pacific
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creator BATTEN, A. H.
FLETCHER, J. M.
HILL, G.
LU, WENXIAN
MORBEY, C. L.
description New high-dispersion spectroscopic observations of the visual binary Σ2173 are combined with earlier ones obtained during passage through the opposite node, and with the available visual and interferometric observations, to determine the orbital elements completely. We find P =46y.43, T=1962.52, Ω = 152°.7, ω=98°.7, ω=147°.6, α" = 0°.97, V₀ = -76.98 km s⁻¹ and K₂ = 4.84 km s⁻¹. The parallax derived is O". O59, somewhat larger than the best trigonometrical value of O". O5, which leads to masses and luminosities for the components in good agreement with the spectral types and luminosity classes but which are problematical from the point of view of theoretical studies of stellar evolution. The two stars are very similar: We can distinguish no difference in spectral type and find Δm to be approximately 0ṃ1. The brighter star appears to be the less massive.
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source IOP Publishing Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Jstor Complete Legacy; Institute of Physics (IOP) Journals - HEAL-Link; Alma/SFX Local Collection
subjects Astronomy
Binary and multiple stars
Earth, ocean, space
Exact sciences and technology
Multiple stars
Observational astronomy
Orbital elements
Orbits
Parallax
Radial velocity
Space based observatories
Spectroscopy
Stars
Stellar classification
Stellar luminosities
title THE BINARY SYSTEM Σ2173
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