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Optical Variability of Twenty-Two Quasi-Stellar Objects
1972
Symposium - International astronomical union
Light fluctuations have been found in all 22 QSOs studied by measurement of plates from the Harvard collection, which cover the last eighty years. The conclusions of this study are: (i) There appear to be at least three general classes of variation: (a) erratic, small-amplitude variations, (b) erratic, large-amplitude variations, and (c) slow quasi-periodic variations, e.g. as in 3C 273; (ii) No significant differences were detected between the rates of rise and decline of luminosity; (iii)
doi:10.1017/s0074180900005490
fatcat:g6oiq6xljjbobkf3clz5snqnrq