Mass Loss and Evolution of O-Type Stars pp 291-295 | Cite as
The Binary Orbit of HD 92740
Abstract
HD 92740 is a star located in the Carina nebula showing a Wolf-Rayet spectrum of type WN7.Faint absorption lines of the upper Balmer series of hydrogen,and also of the Pickering series of HeII are present in the spectrum,in addition to the WN emissions.Although absorption lines present in a Wolf-Rayet spectrum are generally assumed to arise in a companion OB star,a previous study (Niemelä 1973) of the radial velocities of HD 92740 showed that the absorption and emission lines followed the same orbital motion.Subsequent spectral observations of this star have been carried out at the Cerro Tololo Inter-American Observatory,Chile,and at the Córdoba Observatory,Argentina,during four years;the observational data are listed in Conti,Niemelä and Walborn (1978).These observations showed that the true period is 8 times longer than the initially derived period of 10 days,and that doubtlessly the absorption lines belong to the WN star.
Keywords
Radial Velocity Absorption Line Balmer Line Orbital Solution Radial Velocity CurvePreview
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References
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