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Astronomy & Astrophysics

A new orbital solution for the massive binary system HD93403+

G. Rauw1,*,***, H. Sana1, E. Gosset1,**,***, J.-M. vreux1, E. Jehin1 and G. Parmentier1

1 Institut d'Astrophysique et de Géophysique - Université de Liège, Avenue de Cointe 5, 4000 Liège, Belgium

* Postdoctoral Researcher FNRS, Belgium
** Research Associate FNRS, Belgium
*** Visiting Astronomer, CTIO, National Optical Astronomy Observatories (NOAO). NOAO is operated by the Association of Universities for Research in Astronomy, Inc. under contract with the National Science Foundation.

+ Based on observations collected at the European Southern Observatory (La Silla, Chile) and the Cerro Tololo Inter-American Observatory (CTIO)


     We present a spectroscopic analysis of the early-type massive binary system HD93403. Using high resolution optical spectra, we clearly separate the primary and secondary components. For the first time, we are able to provide an orbital solution for both stars. Our new orbital parameters show discrepancies with the previous solution published by Thackeray & Emerson (1969). We further discuss several spectral features of HD93403. We finally derive qualitative constraints on the inclination of the system and we discuss its evolutionary status and the position of both components in the Hertzsprung-Russell diagram.

Key Words
binaries: spectroscopic - stars: early-type - stars: fundamental parameters - stars: individual: HD93403

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