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Paper: Long-Term Optical Spectra Variability of Quasar 3C 273
Volume: 408, The Starburst−AGN Connection
Page: 388
Authors: Zhang, H.J.; Zhao, G.; Zhang, X.; Wang, X.H.
Abstract: In this paper, we compiled all the magnitudes of 35 years in the optical B, V, R band of quasar 3C 273, studied on the long-term optical spectral index variability behavior. Using this database, we found two periods of 15.7 and 10.5 years by two methods. These results were consistent with Jurkevich’s and Ozernoi’s, and found that the magnitude variation period of 3C 273 was in agreement with the spectral variation period of about 15.7 years.
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