Masses of the components of SB2 binaries observed with Gaia. V. Accurate SB2 orbits for 10 binaries and masses of the components of 5 binaries

TL;DR

This study combines spectroscopic, interferometric, and Gaia astrometric data to accurately determine the masses of components in 10 SB2 binaries, achieving about 1% precision for five systems, enhancing stellar mass measurements.

Contribution

The paper presents new precise orbital solutions for 10 SB2 binaries and derives component masses for 5 systems using combined observational techniques, including Gaia data.

Findings

Masses of 5 binary components determined with ~1% accuracy.

Orbital parameters for 10 SB2 systems re-calculated.

Mass range from 0.51 to 2.2 solar masses.

Abstract

Double-lined spectroscopic binaries (SB2s) are one of the main sources of stellar masses, as additional observations are only needed to give the inclinations of the orbital planes in order to obtain the individual masses of the components. For this reason, we are observing a selection of SB2s using the SOPHIE spectrograph at the Haute-Provence observatory in order to precisely determine their orbital elements. Our objective is to finally obtain masses with an accuracy of the order of one percent by combining our radial velocity (RV) measurements and the astrometric measurements that will come from the Gaia satellite. We present here the RVs and the re-determined orbits of 10 SB2s. In order to verify the masses we will derive from Gaia, we obtained interferometric measurements of the ESO VLTI for one of these SB2s. Adding the interferometric or speckle measurements already published by us or by others for 4 other stars, we finally obtain the masses of the components of 5 binary stars, with masses ranging from 0.51 to 2.2 solar masses, including main-sequence dwarfs and some more evolved stars whose location in the HR diagram has been estimated.