Table 8: Binary systems parameters for the 6 binaries in the $\sigma $ Ori cluster for which a sinusoidal fit of the RV curves was performed. Errors are $1\sigma $.

ID		 $V_\circ^{a}$ (km s-1) Pb (days) K1c (km s-1) K2c (km s-1) $a_1 \sin i^{d}$ ($R_\odot$) $a_2 \sin i^{d}$ ($R_\odot$) f(M)e ($M_{\odot }$) M1/M2f

S29		 $32.06 \pm 0.73$ $8.72 \pm 0.02 $ $25.4 \pm 1.3$ $41.7 \pm 1.3$ $4.38 \pm 0.22$ $7.18 \pm 0.22$ $0.015 \pm 0.002$ $1.64 \pm 0.10$
S53 $30.61 \pm 1.06$ $8.52 \pm 0.01$ $29.1 \pm 2.8$ $32.1 \pm 2.3$ $ 4.90 \pm 0.46$ $5.39 \pm 0.39$ $0.022 \pm 0.006$ $1.10 \pm 0.13$
S84 $23.43 \pm 0.69$ $6.07 \pm 0.01$ $43.8 \pm 1.3$ $43.8 \pm 1.3$ $5.25 \pm 0.16$ $5.25 \pm 0.16$ $0.053 \pm 0.005$ $1.00 \pm 0.04$
S85 $72.34 \pm 0.88$ $12.78 \pm 0.02$ $35.3 \pm 2.3$ $43.0 \pm 2.3$ $8.91 \pm 0.59$ $10.84 \pm 0.59$ $0.058 \pm 0.012$ $1.22 \pm 0.10$
S89 $16.54 \pm 2.02$ $13.82 \pm 0.04$ $69.8 \pm 4.4$ $86.5 \pm 4.4$ $19.02 \pm 1.19$ $23.59 \pm 1.20$ $0.486 \pm 0.092$ $1.24 \pm 0.10$
S96 - $34.79 \pm 1.19$ $3.895 \pm 0.004$ $43.4 \pm 1.6$ ... $3.33\pm 0.12$ ... $0.033 \pm 0.004$ ...
a Velocity of the binary system center of mass; b period of the binary system; c semi-amplitude of the RV curve; d semi-major axis of the binary orbit; e binary system mass function; f mass ratio of the binary components.

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