UBVRI PHOTOMETRY OF THE PULSATIONS IN V2116 OPHIUCHI-GX1+4

The colours of pulsed and non-pulsed Light in V2116 Oph have been meas ured with the UBVRI photometer of the Laboratorio Nacional de Astrofis ica, in Brazil. The symbiotic binary was in an optical bright state wi th V similar to 17. If the blue component in the spectrum of V2116 Oph follows the prescription for a standard optically thick accretion dis c spectrum, its contribution to the light of the system at 6600 Angstr om is similar to 20 times the contribution of the red giant, with E(B - V) = 2.1 +/- 0.1 mag and a distance of 8.3 kpc. The pulsed component is estimated to have M-V similar to -1.7, implying characteristic siz es (for blackbody emission) of 1.4, 4.3 and 9.3 R-., for temperatures T-BB = 100 000, 20 000 and 10 000 K, respectively.