TRIGILIO, CORRADOCORRADOTRIGILIOBUEMI, CARLA SIMONACARLA SIMONABUEMIUMANA, Grazia Maria GloriaGrazia Maria GloriaUMANARodonò, M.M.RodonòLETO, PAOLOPAOLOLETOBeasley, A. J.A. J.BeasleyPAGANO, IsabellaIsabellaPAGANO2023-01-242023-01-2420010004-6361http://hdl.handle.net/20.500.12386/33058We present multifrequency VLA and VLBA observations at 8.4 GHz of the RS CVn system {AR Lac}, that were performed in autumn 1997 simultaneously with X-ray observations obtained from Rodonòet al. (\cite{Rodono}). Our VLBA data indicate a resolved source with dimension close to the system separation, while the study of the flux density curve reveals a small amplitude outside of the eclipse variability. The derived five-frequencies spectra, combined with the size information from VLBA data, are compared with gyrosynchrotron emission from a two component structured source. A comparison with the results of the X-ray observations allow us to exclude the possibility that a thermal gyrosynchrotron is responsible for the radio emission, but it is compatible with the hypothesis of co-spatial X-ray and radio emitting sources.STAMPAenArticle10.1051/0004-6361:200105662-s2.0-0035401992https://www.aanda.org/articles/aa/abs/2001/25/aa10553/aa10553.html2001A&A...373..181TFIS/05 - ASTRONOMIA E ASTROFISICA