2004/10/19 by V. S. Niemela, R. C. Gamen · 2 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1111/j.1365-2966.2004.08513.x
published as Mon.Not.Roy.Astron.Soc. 356 (2005) 974-978 · 7 pages, 4 figures, accepted for MNRAS
arxiv created 2004/10/19 · openalex publication_date 2005/01/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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 d. 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 M⊙. 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.