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arXiv · 1510.07412

Masses of the components of SB2 binaries observed with Gaia. II. Masses derived from PIONIER interferometric observations for Gaia validation

J. -L. Halbwachs·H. M. J. Boffin·J. -B. Le Bouquin·F. Kiefer·B. Famaey·J. -B. Salomon·F. Arenou·D. Pourbaix·F. Anthonioz·R. Grellmann·S. Guieu·H. Sana·P. Guillout·A. Jorissen·Y. Lebreton·T. Mazeh·L. Tal-Or·A. Nebot Gomez-Moran
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Abstract

In anticipation of the Gaia astrometric mission, a sample of spectroscopic binaries is being observed since 2010 with the 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 % 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 percent 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.

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J. -L. Halbwachs, H. M. J. Boffin, J. -B. Le Bouquin, F. Kiefer, B. Famaey, J. -B. Salomon, F. Arenou, D. Pourbaix, F. Anthonioz, R. Grellmann, S. Guieu, H. Sana, P. Guillout, A. Jorissen, Y. Lebreton, T. Mazeh, L. Tal-Or, A. Nebot Gomez-Moran. 2015-10-26. Masses of the components of SB2 binaries observed with Gaia. II. Masses derived from PIONIER interferometric observations for Gaia validation. https://doi.org/10.1093/mnras%2Fstv2497

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