Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-10-19
Mon.Not.Roy.Astron.Soc. 356 (2005) 974-978
Astronomy and Astrophysics
Astrophysics
7 pages, 4 figures, accepted for MNRAS
Scientific paper
10.1111/j.1365-2966.2004.08513.x
From radial velocities determined in high signal-to-noise digital spectra, we report the discovery that the brightest component of the binary system HD 150136 is of spectral type O3. We also present the first double-lined orbital solution for this binary. Our radial velocities confirm the previously published spectroscopic orbital period of 2.6 days. He II absorptions appear double at quadratures, but single lines of N V and N IV visible in our spectra define a radial velocity orbit of higher semi-amplitude for the primary component than do the He II lines. From our orbital analysis, we obtain minimum masses for the binary components of 27 and 18$\modot$. The neutral He absorptions apparently do not follow the orbital motion of any of the binary components, thus they most probably arise in a third star in the system.
Gamen Roberto C.
Niemela Virpi S.
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