Age and helium content of the open cluster NGC  6791 from multiple eclipsing binary members - I. Measurements, methods, and first results

K. Brogaard; H. Bruntt; F. Grundahl; J. V. Clausen; S. Frandsen; D. A. VandenBerg; L. R. Bedin

doi:10.1051/0004-6361/201015503

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Volume 525 (January 2011)

A&A, 525 (2011) A2

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Table 10

Astrophysical data for V18, V20 and V80.

	V18		V20		V80
	Primary	Secondary	Primary	Secondary	Primary	Secondary

Absolute dimensions:
M/M_⊙	0.9955 ± 0.0033	0.9293 ± 0.0032	1.0868 ± 0.0039	0.8276 ± 0.0022	1.0588 ± 0.0091	0.8003 ± 0.0062
R/R_⊙	1.1011 ± 0.0068	0.9708 ± 0.0089	1.397 ± 0.013	0.7813 ± 0.0053	1.341 ± 0.081	0.90 ± 0.18
log g (cgs)	4.3524 ± 0.0053	4.4319 ± 0.0080	4.1840 ± 0.0078	4.5698 ± 0.0059	4.208 ± 0.052	4.43 ± 0.18

T_eff (K)^a	5600 ± 95	5430 ± 125	5645 ± 95	4824 ± 140	5600 ± 95	(...)

v_rot (km s^-1)^b	4.0 ± 1.0	3.5 ± 1.0	4.50 ± 1.00	(...)	14.1 ± 2.0	(...)
v_sync (km s^-1)^b	2.96 ± 0.14	2.61 ± 0.13	4.88 ± 0.04	2.73 ± 0.02	13.88 ± 0.83	9.33 ± 1.9

V	18.247 ± 0.020	18.740 ± 0.020	17.695 ± 0.020	19.874 ± 0.020	(...)^c	(...)^c
M _V	4.76 ± 0.10	5.22 ± 0.10	4.19 ± 0.10	6.44 ± 0.18	(...)^c	(...)^c
(V − M_V)	13.49 ± 0.10	13.52 ± 0.10	13.50 ± 0.10	13.44 ± 0.18	(...)^c	(...)^c
(V₀ − M_V)	13.00 ± 0.13	13.03 ± 0.13	13.01 ± 0.13	12.95 ± 0.20	(...)^c	(...)^c
distance (kpc)	3.98 ± 0.25	4.04 ± 0.25	4.00 ± 0.25	3.89 ± 0.34	(...)^c	(...)^c

Notes.

^(a)

T_eff values are our spectroscopic measurements, except for T_eff of V20s, which is calculated as T_eff of V20p minus the difference in photometrically predicted temperatures between V20p and V20s assuming E(B − V) = 0.16.

^(b)

v_rot is the observed equatorial rotational velocities calculated by combining vsini and sini measurements. v_sync is the theoretical equatorial velocity for synchronous rotation.

^(c)

Absolute magnitudes and distance moduli have not been calculated for V80 because these are very uncertain due to uncertain V magnitudes and radii (and T_eff for V80s) caused by the magnetic activity.

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