Masses of the components of SB2s observed with Gaia - II. Masses derived from PIONIER interferometric observations for Gaia validation
Mazeh, T.; Grellmann, R.; Tal-Or, L.; Halbwachs, J. -L.; Guieu, S.; Arenou, F.; Jorissen, A.; Pourbaix, D.; Guillout, P.; Lebreton, Y.; Boffin, H. M. J.; Sana, H.; Kiefer, F.; Famaey, B.; Le Bouquin, J. -B.; Salomon, J. -B.; Anthonioz, F.; Gómez-Morán, A. Nebot
France, Chile, Israel, Belgium, Germany
Abstract
In anticipation of the Gaia astrometric mission, a sample of spectroscopic binaries is being observed since 2010 with the Spectrograph pour l'Observation des PHénomènes des Intérieurs stellaires et des Exoplanètes (SOPHIE) 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 combined with Gaia astrometric measurements. In order to validate the masses derived from Gaia, interferometric observations are obtained for three SB2s in our sample with F-K components: HIP 14157, HIP 20601 and HIP 117186. The masses of the six stellar components are derived. Due to its edge-on orientation, HIP 14157 is probably an eclipsing binary. We note that almost all the derived masses are a few per cent larger than the expectations from the standard spectral type-mass calibration and mass-luminosity relation. Our calculation also leads to accurate parallaxes for the three binaries, and the Hipparcos parallaxes are confirmed.