Table 1: Selected local comparison stars and their colour indexes.
Variable Comparison V B-V U-B Remark

HD [mag] [mag] [mag]

V539 Ara 161 917 6.086 0.014 -0.042 this paper

GG Lup 136 334 6.209 0.068 0.073 used by Andersen et al. (1993)

V526 Sgr 178 110 8.745 -0.006 -0.266 used by Lacy (1993)

AO Vel 68 657 5.821 -0.152 -0.627 used by Grønbech (1985)

**Table 1:** Selected local comparison stars and their colour indexes.
Variable	Comparison	V	B-V	U-B	Remark
	HD	[mag]	[mag]	[mag]
V539 Ara	161 917	6.086	0.014	-0.042	this paper
GG Lup	136 334	6.209	0.068	0.073	used by Andersen et al. (1993)
V526 Sgr	178 110	8.745	-0.006	-0.266	used by Lacy (1993)
AO Vel	68 657	5.821	-0.152	-0.627	used by Grønbech (1985)

Source LaTeX | All tables | In the text

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