The spectroscopic orbit of HD 128220

Astronomy and Astrophysics – Astronomy

Scientific paper

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Binary Stars, O Stars, Stellar Evolution, Stellar Orbits, Subdwarf Stars, Astronomical Models, Stellar Mass, Stellar Spectra, Stellar Winds

Scientific paper

HD 128220 is a double-lined binary containing a subdwarf O star. A new orbital solution is presented, based principally on IUE spectroscopy. The implications of the solution for the physical parameters of the subdwarf are discussed, with the results that MOsin3i = 1.6±0.7 M_sun;; ROsin3/2i = 1.2±0.4 R_sun;; and log(LOsin3i/L_sun;) = 3.6±0.3.

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