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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
Teff    (K)a 5600 ± 95 5430 ± 125 5645 ± 95 4824 ± 140 5600 ± 95 (...)
vrot (km s-1)b 4.0 ± 1.0 3.5 ± 1.0 4.50 ± 1.00 (...) 14.1 ± 2.0 (...)
vsync (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 − MV) 13.49 ± 0.10 13.52 ± 0.10 13.50 ± 0.10 13.44 ± 0.18 (...)c (...)c
(V0 − MV) 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)

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

(b)

vrot is the observed equatorial rotational velocities calculated by combining vsini and sini measurements. vsync 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 Teff for V80s) caused by the magnetic activity.

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