Early-type stars in the young open cluster NGC 2244 and in the Monoceros OB2 association - I. The multiplicity of O-type stars

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Volume 502 / No 3 (August II 2009)

A&A, 502 3 (2009) 937-950

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Table 4:

Possible orbital parameters of the SB1 solution of HD 46 573^a.
Parameter	Circular	Eccentric
P(days)	10.67 (fixed)	10.67 (fixed)
e	...	0.47 $\pm$ 0.13
$\omega$ (degrees)	...	254.63 $\pm$ 14.2
T₀	3732.24 $\pm$ 0.26	3731.68 $\pm$ 0.48
$\gamma$ (km s^-1)	49.7 $\pm$ 0.7	50.9 $\pm$ 0.8
K (km s^-1)	6.9 $\pm$ 0.9	8.5 $\pm$ 1.1
$a\:\sin i$ ( $R_\odot$ )	1.46 $\pm$ 0.19	1.58 $\pm$ 0.24
f(m) ( $M_{\odot}$ )	0.0003 $\pm$ 0.0001	0.0005 $\pm$ 0.0002
rms (km s^-1)	3.5	2.6
Prob ( $\chi^2~>$ )	78%	99%

^a T₀ (expressed in HJD-2 450 000) refers to the time of periastron passage for e $\neq$ 0 and to the conjunction with the primary star in front for e = 0. $\gamma$ , K, and $a\:\sin i$ are, respectively, the systemic velocity, the semi-amplitude of the radial velocity curve, and the projected separation between the center of the star and the center of mass of the binary system. The orbital elements are given for a circular and an eccentric orbit, respectively, by the RVs of both He I $\lambda$ 4471 and $\lambda$ 5876.

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