We tested the distances derived from the equivalent widths of interstellar CaII spectral lines by Megier et al .
2009 .
To this end , we used a sample of nearby 126 young OB3 stars ( r < 1 kpc ) with known proper motions and line-of-site velocities .
It is shown that these stars are tightly bounded with the Gould Belt structure .
Most part of this sample ( about 100 stars ) show the same kinematics as the sample of distant OB3 stars .
Their galactocentric radial velocities are in good agreement with the following spiral density wave parameters : amplitude of radial perturbations f _ { R } \approx 12Â km/s , wavelength \lambda \approx 2.3 Â kpc and phase of the Sun in spiral wave \chi _ { \odot } \approx - 90 ^ { \circ } .
But we revealed 20 stars with absolutely unusual kinematical features .
Their galactocentric radial velocities show a wave , biased on \approx 180 ^ { \circ } with respect to the wave , found from the whole sample .
The idea of superposition of two spiral patterns seems to be probable .