10 eclipsing binaries radial velocities

Disentangled spectra of DEBs were used to derive atmospheric parameters of their components by applying the GSSP code. Direct effective temperatures were also calculated using spectral energy distribution analysis. The O-C diagrams of minima times were investigated in order to detect long-term period changes or apsidal motions.

Most of the systems are composed of significantly unequal components with mass ratios as low as ~0.5. We derived precise masses, radii and surface temperatures for them, as well as their metallicities. The average precision of mass and radii determinations is 0.3% and 1.4% for the surface temperature.

The spectroscopic and photometric temperatures of the components are usually consistent to within 100K but in some systems the difference is much larger. Components of HD 149946 show the highest difference (up to 400K) and the atmospheric models favours different surface metallicities. We also provide an updated calibration of the equivalent width of the interstellar sodium D1 line and the reddening E(B-V).