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A high-accuracy multisite campaign was carried out from 2002 January to Maywith a photometric coverage of 398 hours at five observatories. Theconcentration on a few selected sites gives better consistency and accuracythan collecting smaller amounts from a larger number of sites. 23 frequencieswere detected with a high statistical significance. 6 of these are new. The 17frequencies found in common with the 1992-1995 data are the modes with highestamplitudes. This indicates that the pulsation spectrum of FG Vir is relativelystable over the ten-year period. Two frequencies have variable amplitudes andphases from year to year as well as during 2002. These were both found to bedouble modes with close frequencies. For the mode at 12.15 c/d this leads to anapparent modulation with a time scale of about 129d. The close frequencies at12.15 c/d are composed of a radial and a nonradial mode, suggesting asimilarity with the Blazhko Effect seen in RR Lyrae stars.

The δ Scuti star FG Vir. V. The 2002 photometric multisite campaign