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Table 3

Orbital parameters of BD +60 73.

Parameter Best fit

P (d) 15.6627 ± 0.0042 a
T0 (HJD-2 450 000) 3000.04 ± 0.34
e
ω (deg) 167 ± 6
K1 (km s-1) 19 ± 2
γ1 (km s-1) − 79 ± 12
γ2 (km s-1) − 81 ± 3
γ3 (km s-1) − 77 ± 2
γ4 (km s-1) − 68.7 ± 0.5
f(m) (M) 0.009 ± 0.002
a1sini (km) 3.8 ± 0.3 × 106
σ (km s-1) 4.49

Notes. Included are the period (P), the time of periastron (T0), the eccentricity (e), the angle of the line of nodes (ω), the velocity semi-amplitude (K1), the centre-of-mass velocity for the different instrument configurations (γ1 = DDO 1800G, γ2 = DDO 600C, γ3 = DDO He i, γ4 = KPNO He i), the mass-function (f(M)), the projected semi-major axis (a1sini), and the standard error of the fit (σ). γ2 is adopted as the centre-of-mass velocity, as discussed in the text.

(a)

Fixed.

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