Age and helium content of the open cluster NGC 6791 from multiple eclipsing binary members - II. Age dependencies and new insights

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Volume 543 (July 2012)

A&A, 543 (2012) A106

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Table 1

Astrophysical data for the eclipsing binaries V18 and V20.

	V18		V20
	Primary	Secondary	Primary	Secondary

M/M_⊙	0.9955±0.0033	0.9293±0.0032	1.0868±0.0039	0.8276±0.0022
R/R_⊙	1.1011±0.0068	0.9708±0.0089	1.397±0.013	0.7813±0.0053
log g (cgs)	4.3524±0.0053	4.4319±0.0080	4.1840±0.0078	4.5698±0.0059
T_eff (K)^a	5600±95	5430±125	5645±95	4860±125^a
V	18.256±0.020	18.748±0.020	17.702±0.020	19.886±0.020
B C_V	− 0.084±0.018	− 0.123±0.034	− 0.074±0.018	-0.344^a
M_V	4.76±0.12	5.20±0.16	4.20±0.09	6.38±0.15^a
(m − M)_V	13.50±0.12	13.55±0.16	13.51±0.09	13.51±0.09^a

Notes. Measurements from Paper I, slightly updated using new photometry and a new approach for V20s. Values that are different from, or were not included in, Paper I are in boldface.

^(a)

T_eff values are spectroscopic measurements, except for T_eff of V20s, which is calculated assuming the same distance modulus as for V20p.

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