87 stars in the NGC 6913 field with both UBV and Vilnius photometry are selected to be the sample. The membership probability of the stars is greater than 50%.
The gamma-ray blazar 1611+343 was observed with polarization VLBI mode at 5 GHz in February 1999. The total intensity (I) VLBI image of the source shows a core-
Quasi-simultaneous VLBI observations at 15-86 GHz have shown that in the classical superhluminal radio source 3C 273, the spectral index α (Sν oc να)has a s