New version of the Baade--Becker--Wesselink method based on multiphase
  effective temperature measurements of Cepheids
  A new version of the Baade--Becker--Wesselink (hereafter BBW) method is
proposed, based on direct spectroscopic measurements of effective temperatures
of 45 northern Cepheids, made in different pulsating phases. By comparing the
temperature estimates obtained from the calibration of effective temperature by
normal color with real temperature measurements we were able not only to
determine the color excess with an accuracy of 0.01 mag, but also to derive new
color calibration of the effective temperature immediately for all available
measurements with taking into account the differences in [Fe/H] and log g
values: log Teff = 3.88 - 0.20 (B-V)o + 0.026 (B-V)o^2 + 0.009 log g - 0.010
(B-V)o log g - 0.051 [Fe/H] + 0.051 (B-V)o [Fe/H], which is accurate to about
1.1%. We also showed the complete identity of the two main versions of the BBW
technique: surface brightness method proposed by Barnes and Evans (1976) and
maximum likelyhood method of Balona (1977), refined later by Rastorguev and
Dambis (2010).
