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Table 2:

Orbital and physical parameters derived for the best-fit Keplerian model of Cha H$\alpha $ 8.

Parameter
Value
P (days)................ 1895 $\pm$ 132
T (HJD-2 450 000)  3163 $\pm$ 214
e .......................... 0.59 $\pm$ 0.22
$\omega$ ($^{\circ}$) ..................... 106 $\pm$ 26
K (km s-1)............. 2.433 $\pm$ 0.44
V0 (km s-1) .......... 16.693 $\pm$ 0.75
f(m) ( $10^{-3}~M_{\odot}$)... 1.488
$M_2\sin i$ ($M_{\rm Jup}$)... 25 $\pm$ 7a, 31 $\pm$ 8a
$a_1 \sin i$ (AU) ...... 0.34 $\pm$ 0.09
a2 (AU) ............... 1.02 $\pm$ 0.06 a, 1.17 $\pm$ 0.07a
$N_{\rm meas}$ ............... 18
Span (days) ........ 3618
$\sigma$ (O-C)(m/s) ....... 228
$\chi^{2}_{\rm red}$ .................. 1.45

Notes. The given parameters are: orbital period, periastron time, eccentricity, longitude of periastron, RV semi-amplitude, system velocity, mass function, lower limit of the companion mass, lower limit of the semi-major axis of the primary, semi-major axis of the companion, number of measurements, time span of the observations, residuals, reduced $\chi^2$. (a) Derived parameter based on two available estimates for the primary mass of 0.07 $M_{\odot}$ and 0.10 $M_{\odot}$. No further errors of the primary mass, e.g. as introduced by the use of evolutionary models, have been taken into account here.


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