Table 2: Fundamental parameters of the WN6ha stars of WR 20a and of their stellar winds as determined from our spectral analysis. Note that the luminosity and mass-loss rate are given for a single component. The mass loss rate is based on a clumped wind model with a volume filling factor of f = 0.1.
Parameter Value

Mass ( $M_{\odot }$ ) $82.7 \pm 5.5$ (primary)

Mass ( $M_{\odot }$ ) $81.9 \pm 5.5$ (secondary)

$L_{\rm bol}$ ( $L_{\odot}$ ) $(1.15 \pm 0.15) \times 10^{6}$

$T_{\rm eff}$ (K) $43~000 \pm 2000$

$\dot{M}$ ( $M_{\odot }$ yr^-1) $8.5 \times 10^{-6}$

R_* ( $R_{\odot}$ ) $19.3 \pm 0.5$

$v_{\infty}$ (km s^-1) 2800 (adopted)

$\log{g}$ 3.8

(B - V)₀ -0.33

(V - I)₀ -0.36

E(B - V) $1.94 \pm 0.05$

$A_{\rm V}$ (mag) $6.02 \pm 0.16$

d (kpc) $7.9 \pm 0.6$

**Table 2:** Fundamental parameters of the WN6ha stars of WR 20a and of their stellar winds as determined from our spectral analysis. Note that the luminosity and mass-loss rate are given for a single component. The mass loss rate is based on a clumped wind model with a volume filling factor of f = 0.1.
Parameter	Value
Mass ( $M_{\odot }$ )	$82.7 \pm 5.5$ (primary)
Mass ( $M_{\odot }$ )	$81.9 \pm 5.5$ (secondary)
$L_{\rm bol}$ ( $L_{\odot}$ )	$(1.15 \pm 0.15) \times 10^{6}$
$T_{\rm eff}$ (K)	$43~000 \pm 2000$
$\dot{M}$ ( $M_{\odot }$ yr^-1)	$8.5 \times 10^{-6}$
R_* ( $R_{\odot}$ )	$19.3 \pm 0.5$
$v_{\infty}$ (km s^-1)	2800 (adopted)
$\log{g}$	3.8
(B - V)₀	-0.33
(V - I)₀	-0.36
E(B - V)	$1.94 \pm 0.05$
$A_{\rm V}$ (mag)	$6.02 \pm 0.16$
d (kpc)	$7.9 \pm 0.6$

Source LaTeX | All tables | In the text

	1 Introduction
	2 Observations
	3 The optical spectrum of WR 20a
	4 Line profile variability
	5 Fundamental parameters
	6 Discussion and future perspectives
	7 Summary and concluding remarks
	References