A PHOTOMETRIC-STUDY OF THE DELTA-SCUTI STAR FG-VIRGINIS UNDERTAKEN DURING 1985/6

Ninety-three hours of photoelectric photometry of FG Vir were obtained during 1985 and 1986. Seven frequencies of pulsation with significant detections could be extracted from the photometry. The seven detected frequencies agree with those found in a larger, independent photometric study by Breger et al. [A&A, 271, 482 (1993)] carried out during 1993, in which ten frequencies were found. The present data also show the eighth and ninth frequencies found during 1993, but below the signal-to-noise limit of significance adopted in our studies. The y amplitudes determined from the present work and the 1993 data agreed to +/- 1.0 mmag, suggesting that no significant amplitude variations occurred during the eight years. For the dominant frequency of 12.72 c/d a phase shift of phi(b-y) - phi(y) = -7-degrees is found, compatible with a nonradial p mode of l = 1 and 2.