Masses of the components of SB2 binaries observed with Gaia – III. Accurate SB2 orbits for 10 binaries and masses of HIP 87895

• Published in: Monthly notices of the Royal Astronomical Society 2016-05, Vol.458 (3), p.3272-3281
• Main Authors: Kiefer, F., Halbwachs, J.-L., Arenou, F., Pourbaix, D., Famaey, B., Guillout, P., Lebreton, Y., Nebot Gómez-Morán, A., Mazeh, T., Salomon, J.-B., Soubiran, C., Tal-Or, L.
• Format: Article
• Language: English
• Subjects: Accuracy; Algorithms; Astrophysics; Binary stars; Double stars; Error analysis; Instrumentation and Methods for Astrophysic; Observatories; Orbital elements; Orbits; Radial velocity; Sciences of the Universe; Solar and Stellar Astrophysics; Spectra; Spectroscopy; Spectrum analysis; Star & galaxy formation
• ISSN: 0035-8711; 1365-2966
• DOI: 10.1093/mnras/stw545

In anticipation of the Gaia astrometric mission, a large sample of spectroscopic binaries has been observed since 2010 with the Spectrographe pour l'Observation des PHénomènes des Intérieurs Stellaires et des Exoplanètes spectrograph at the Haute–Provence Observatory. Our aim is to derive the orbital elements of double-lined spectroscopic binaries (SB2s) with an accuracy sufficient to finally obtain the masses of the components with relative errors as small as 1 per cent when the astrometric measurements of Gaia are taken into account. In this paper, we present the results from five years of observations of 10 SB2 systems with periods ranging from 37 to 881 d. Using the todmor algorithm, we computed radial velocities from the spectra, and then derived the orbital elements of these binary systems. The minimum masses of the components are then obtained with an accuracy better than 1.2 per cent for the 10 binaries. Combining the radial velocities with existing interferometric measurements, we derived the masses of the primary and secondary components of HIP 87895 with an accuracy of 0.98 and 1.2 per cent, respectively.