Absolute kinematics of radio source components in the complete S5 polar cap sample - I. First and second epoch maps at 8.4 GHz

We observed the thirteen extragalactic radio sources of the S5 polar cap sa mple at 8.4 GHz with the Very Long Baseline Array, on 1997.93 and 1999.41. We present the maps from those two epochs and briefly discuss the morpholog ical changes experimented by some of the radio sources in the 1.4 yr elapse d. These results correspond to the first two epochs at 8.4 GHz of a program directed to study the absolute kinematics of the radio source components o f the members of the sample by means of phase delay astrometry at 8.4, 15 a nd 43 GHz.