  Stromgren synthetic photometry from an empirically calibrated grid of stellar
atmosphere models has been used to derive the effective temperature of each
component of double lined spectroscopic (SB2) eclipsing binaries. For this
purpose, we have selected a sub-sample of 20 SB2s for which b-y, m_1, and c_1
individual indices are available. This new determination of effective
temperature has been performed in a homogeneous way for all these stars. As the
effective temperature determination is related to the assumed metallicity, we
explore simultaneous solutions in the (Teff,[Fe/H])-plane and present our
results as confidence regions computed to match the observed values of surface
gravity, b-y, m_1, and c_1, taking into account interstellar reddening. These
confidence regions show that previous estimates of Teff are often too
optimistic, and that [Fe/H] should not be neglected in such determinations.
Comparisons with Ribas et al. (1998) using Hipparcos parallaxes are also
presented for 8 binaries of our working sample, showing good agreement with the
most reliable parallaxes. This point gives a significant weight to the validity
of the BaSeL models for synthetic photometry applications.
