The milli-arcsecond structure of a complete sample of radio sources. I - VLBI maps of seven sources

The sample of 51 sources between declinations 35 deg and 70 deg with galactic latitude greater than 10 deg and flux density greater than or equal to 1.3 Jy at 5 GHz contains 36 objects that are suitable for study by very long baseline interferometry (VLBI). Observations have been made of seven of these with a VLBI array of four antennas at a frequency of 5 GHz with full hour-angle coverage. The results show a wide variety of morphologies: two sources (0133+476 and 0859+470) are only slightly resolved, one is a double source (0923+392 = 4C 39.25) with a constant separation, three (1807+698 = 3C 371, 1828+487 = 3C 380, and 2200+420 = BL Lac) have an elongated linear structure, and the last (0316+413 = 3C 84) is complex.