Astrometry & kinematics of cataclysmic variables

By constraining the data according to the total space velocity error and Galactic population class, a reliable sample of data was obtained. Nonmagnetic CVs located in the thin disk have been found to have a total space velocity dispersion of {sigma}_{nu}_=46.33+/-4.23km/s, indicating that the thin disk CVs with a mean kinematical age of {tau}=3.95+/-0.75Gyr are much younger than the local thin disk of the Galaxy with {tau} ~6-9Gyr.

Total space velocity dispersions of nonmagnetic CVs belonging to the thin disk component of the Galaxy were found to be {sigma}_{nu}_=47.67+/-3.94 and {sigma}_{nu}_=44.43+/-4.33km/s for the systems below and above the orbital period gap, respectively, corresponding to kinematical ages of {tau}=4.19+/-0.71 and {tau}=3.61+/-0.74Gyr. {gamma} velocity dispersions of the thin disk CVs below and above the gap were obtained {sigma}_{gamma}_=27.52+/-2.28 and {sigma}_{gamma}_=25.65+/-2.44km/s, respectively.