Table 3: Apsidal motion elements of V539 Ara, GG Lup, V526 Sgr and AO Vel.
Element Unit V539 Ara GG Lup V526 Sgr AO Vel

T₀ HJD 24 45056.7459 (7) 24 46136.7448 (1) 24 47739.6517 (2) 24 45043.6700 (3)

$P_{\rm s}$ days 3.1690854 (12) 1.8495996 (15) 1.91941177 (8) 1.5846212 (7)

$P_{\rm a}$ days 3.1692552 (12) 1.8496919 (15) 1.91947680 (8) 1.5847476 (7)

e 0.0548 (15) 0.1546 (10) 0.2204 (4) 0.0735 (6)

$\dot{\omega}$ deg $\:\rm {cycle^{-1}}$ 0.0193 (10) 0.0180 (5) 0.01219 (3) 0.0287 (3)

$\dot{\omega}$ deg $\:\rm {yr^{-1}}$ 2.22 (0.1) 3.54 (10) 2.320 (6) 6.61 (10)

$\omega_0$ deg 118.9 (1.2) 86.12 (0.15) 254.9 (0.1) 97.1 (0.1)

U years 161.8 (8.1) 101.6 (1.0) 155.2 (0.2) 54.4 (0.5)

**Table 3:** Apsidal motion elements of V539 Ara, GG Lup, V526 Sgr and AO Vel.
Element	Unit	V539 Ara	GG Lup	V526 Sgr	AO Vel
T₀	HJD	24 45056.7459 (7)	24 46136.7448 (1)	24 47739.6517 (2)	24 45043.6700 (3)
$P_{\rm s}$	days	3.1690854 (12)	1.8495996 (15)	1.91941177 (8)	1.5846212 (7)
$P_{\rm a}$	days	3.1692552 (12)	1.8496919 (15)	1.91947680 (8)	1.5847476 (7)
e		0.0548 (15)	0.1546 (10)	0.2204 (4)	0.0735 (6)
$\dot{\omega}$	deg $\:\rm {cycle^{-1}}$	0.0193 (10)	0.0180 (5)	0.01219 (3)	0.0287 (3)
$\dot{\omega}$	deg $\:\rm {yr^{-1}}$	2.22 (0.1)	3.54 (10)	2.320 (6)	6.61 (10)
$\omega_0$	deg	118.9 (1.2)	86.12 (0.15)	254.9 (0.1)	97.1 (0.1)
U	years	161.8 (8.1)	101.6 (1.0)	155.2 (0.2)	54.4 (0.5)

Source LaTeX | All tables | In the text

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