Abstract
The flare behaviour of OJ 287 during the years 1983 and 1984 is studied on the basis of all the available data in the different wavebands from these years. A strong correlation between the flux and the spectral index is found in the optical wavebands. At the same time there is weak evidence for a 9.3 days periodicity in the same waveband. Time lags of the flares and sharp drops are studied between different wavebands. The sharp events seem to be simultaneous in the region ultraviolet (0.25 μm)-infrared (25 μm) but between these and millimeter wavelengths there seems to be a timelag of 40–60 days so that the short wavelength variations precede the radio ones. In longer wavelengths (>3 cm) the variations are much slower and it is very difficult to find the exact delay times.
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Sillanpää, A. The rise and fall of OJ 287 in 1983–1984: Periodicities and wavelength-dependent delays. Astrophys Space Sci 176, 297–307 (1991). https://doi.org/10.1007/BF00646704
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DOI: https://doi.org/10.1007/BF00646704