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HD 177984


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Contribution to the study of composite spectra: XI. Orbital elements of some faint systems
We present the results of a radial-velocity study of nine new faint SB1spectroscopic binaries with composite spectra: HD 137975-6, 177984, HDE226489, 231613-4, 255387-8, 256138-9, 264997-8, 276787 and 293041-2. Theobservations were made at Haute-Provence and Cambridge observatorieswith CORAVEL instruments between 1982 and 2006. From the radial-velocitymeasurements of the cool components, we derive the orbital elements ofthose spectroscopic binaries for the first time. Using all the availabledata, we propose a model for each system that describes the nature ofthe individual components, with an estimation of the angular separationand orbital inclination. Finally we discuss the rotation-revolutionsynchronism of the cool components.

A survey of stars with composite spectra.
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观测天体数据

星座:天鷹座
右阿森松:19h06m37.65s
赤纬:+07°41'27.4"
视星:9.271
右阿森松适当运动:22.4
赤纬适当运动:-5.9
B-T magnitude:9.886
V-T magnitude:9.322

目录:
适当名称   (Edit)
HD 1989HD 177984
TYCHO-2 2000TYC 1040-297-1
USNO-A2.0USNO-A2 0975-14112411
HIPHIP 93842

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