Table 4: Adopted basic physical properties of the binary components and the internal structure constant.
Parameter Unit V539 Ara GG Lup V526 Sgr AO Vel

M₁ $M_{\odot}$ 6.24 (7) 4.119 (40) 2.27 (7) 4.4

M₂ $M_{\odot}$ 5.31 (6) 2.509 (24) 1.68 (6) 3.6

r₁ 0.220 (4) 0.2000 (20) 0.1843 (4) 0.214 (6)

r₂ 0.167 (4) 0.1450 (15) 0.1521 (8) 0.193 (6)

i deg 85.2 (2) 86.75 (10) 89.1 (3) 85.5 (1.5)

Source Clausen Andersen Lacy Clausen

(1996) et al. (1993) (1997) et al. (1995)

$\dot{\omega}_{\rm rel}$ deg $\:\rm {cycle^{-1}}$ 0.00129 0.00131 0.00093 0.00161

$\dot{\omega}_{\rm rel} / \dot{\omega}$ % 6.7 7.3 7.6 5.8

log $k_{\rm 2, obs}$ -2.326 -2.157 -2.357 -2.243

$\Delta$ log $k_{\rm 2, obs}$ 0.065 0.034 0.012 0.069

log $k_{\rm 2, theo}$ -2.30 -2.18 -2.41 -2.15

Z (metal abundance) 0.02 0.015 0.02 0.02

**Table 4:** Adopted basic physical properties of the binary components and the internal structure constant.
Parameter	Unit	V539 Ara	GG Lup	V526 Sgr	AO Vel
M₁	$M_{\odot}$	6.24 (7)	4.119 (40)	2.27 (7)	4.4
M₂	$M_{\odot}$	5.31 (6)	2.509 (24)	1.68 (6)	3.6
r₁		0.220 (4)	0.2000 (20)	0.1843 (4)	0.214 (6)
r₂		0.167 (4)	0.1450 (15)	0.1521 (8)	0.193 (6)
i	deg	85.2 (2)	86.75 (10)	89.1 (3)	85.5 (1.5)
Source		Clausen	Andersen	Lacy	Clausen
		(1996)	et al. (1993)	(1997)	et al. (1995)
$\dot{\omega}_{\rm rel}$	deg $\:\rm {cycle^{-1}}$	0.00129	0.00131	0.00093	0.00161
$\dot{\omega}_{\rm rel} / \dot{\omega}$	%	6.7	7.3	7.6	5.8
log $k_{\rm 2, obs}$		-2.326	-2.157	-2.357	-2.243
$\Delta$ log $k_{\rm 2, obs}$		0.065	0.034	0.012	0.069
log $k_{\rm 2, theo}$		-2.30	-2.18	-2.41	-2.15
Z (metal abundance)		0.02	0.015	0.02	0.02

Source LaTeX | All tables | In the text

	1 Introduction
	2 Observations
	3 Apsidal motion analysis
	4 Internal structure constant
	5 Conclusions
	References