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Fig. 6

image

Results from our solution grid-search to fit all the PIONIER data. The left panels show the parameters plotted as a function of the orbital period, while the right ones show them as a function of the total mass of the binary, assuming a distance of 5.4 kpc. The upper panels show the difference in ratio of the reduced χ2; the second the semi-major axis, with the line indicating the periastron distance; third is either the mass as a function of period or vice-versa; fourth panels are the time of periastron passage (− 2000); fifth, the eccentricity; the sixth show the inclination of the orbit, while the bottom panels show the radial velocities of the primary assuming a mass ratio of 2. We note the degeneracy in orbital solutions near zero eccentricity. These orbits have slightly worse χ2 than the others at same semi-major axis.

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