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Aims. The aim is to derive accurate stellar distances and extinctions foryoung stars of our survey in the Galactic anticenter direction using theStr\"omgren photometric system. This will allow a detailed mapping of thestellar density and absorption toward the Perseus arm. Methods. We developed anew method for deriving physical parameters from Str\"omgren photometry andalso implemented and tested it. This is a model-based method that uses the mostrecent available stellar atmospheric models and evolutionary tracks tointerpolate in a 3D grid of the unreddened indexes [m1], [c1] and Hbeta.Distances derived from both this method and the classical pre-Hipparcoscalibrations were tested against Hipparcos parallaxes and found to be accurate.Results. Systematic trends in stellar photometric distances derived fromempirical calibrations were detected and quantified. Furthermore, a shift inthe atmospheric grids in the range Teff=[7000,9000]K was detected and acorrection is proposed. The two methods were used to compute distances andreddening for about 12000 OBA-type stars in our Str\"omgren anticenter survey.Data from the IPHAS and 2MASS catalogs were used to complement the detection ofemission line stars and to break the degeneracy between early and latephotometric regions. We note that photometric distances can differ by more than20%, those derived from the empirical calibrations being smaller than thosederived with the new method, which agree better with the Hipparcos data.

Stellar physical parameters from Str \"omgren photometry. Application to the young stars in the Galactic anticenter survey