Abstract
A new high-quality set of orbital parameters for the O-type spectroscopic binary HD 93205 has been obtained combining echelle and coudeCCD observations. The radial velocity orbits derived from the HeII l4686A u (primary component) and He I l4471A u (secondary component) absorption lines yield semi-amplitudes of 133 ^ 2 and 314 ^2kms 21 for each binary component, resulting in minimum masses of 31 and 13M( ðq ¼ 0:42Þ. We also confirm for the binary components the spectral classification of O3V 1 O8V previously assigned. Assuming for the O8V component a 'normal' mass of 22-25M( we would derive for the primary O3Va mass of 'only' 52-60M( and an inclination of about 558 for the orbital plane. We have also determined for the first time a period of apsidal motion for this system, namely 185 ^ 16yr using all available radial velocity data sets of HD 93205 (from 1975 to 1999). Phase-locked variations of the X-ray emission of HD 93205 consisting of a rise of the observed X-ray flux near periastron passage are also discussed.
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