A photometric investigation of the optical variability of Markarian 501
The optical variability of the BL Lacertae object, Markarian 501, has been monitored from 1976–1987. Long-term optical variations have been detected with an amplitude of 0.65 mag. The long-term small amplitude, color variations which have been observed are found to be weakly correlated with the long-term trends in brightness in the sense that the object appears bluer when it is brighter. No evidence has been found for variability on a time scale of days or less for this object.
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