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Infrared Spectroscopy Of Symbiotic Stars. Vi. Combined Orbits For Two S-Type Systems: V455 Scorpii And Ss 73-90, Francis C. Fekel, Kenneth H. Hinkle, Richard R. Joyce, Peter R. Wood, Ian D. Howarth

Information Systems and Engineering Management Research Publications

We have combined new infrared radial velocities and previously obtained spectropolarimetric observations to compute orbits of the M6 giants in two southern S-type symbiotic systems. The spectropolarimetric data enable the orbital inclinations of the systems to be determined, placing greater constraints on the properties of the components. V455 Sco has a circular orbit with a period of 1398 ± 6 days and an inclination of 94° ± 1°. The orbit of SS 73-90 has a period of 898 ± 5 days, a modest eccentricity of 0.16, and an inclination of 97° ± 7°. The center of mass velocity of each …