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Optical Continuum and Emission‐Line Variability of the Seyfert 1 Galaxy Markarian 509
(IOP Publishing, 1996)
We report on the results of a 5 year coordinated program of spectroscopic monitoring of the luminous Seyfert 1 galaxy Markarian 509. The Hβ and He II λ4686 emission lines are found to respond to continuum variations with ...