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Spectral Variability of NGC 4151 in 1972–1991

Published online by Cambridge University Press:  19 July 2016

V.L. Oknyanskij ,
V.M. Lyutyi  and
K.K. Chuvaev
V.L. Oknyanskij
Affiliation:
Shternberg State Astronomical Institute, Universitetskij Prospect 13, Moscow, 119899, Russia, e-mail: OKNYAN@SAI.MSK.SU
V.M. Lyutyi
Affiliation:
Shternberg State Astronomical Institute, Universitetskij Prospect 13, Moscow, 119899, Russia, e-mail: OKNYAN@SAI.MSK.SU
K.K. Chuvaev
Affiliation:
Crimean Astrophysical Observatory, Nauchny, 334413, Crimea, Ukraine

Extract

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After a minimum in the spring of 1984, when the broad permitted lines were found to become much weaker, the spectrum of NGC 4151 became much more like a Sy 2 (Lyutyi et al., 1984; Chuvaev and Oknyanskij, 1989; Penston and Perez, 1984). Recently, this object returned to the high state after about 8 yr in the semiquiescent phase (Oknyanskij et al., 1991).

Type
Poster Contributions: Variability
Information
Symposium - International Astronomical Union , Volume 159: Multi-Wavelength Continuum Emission of AGN , 1994 , pp. 401
Copyright
Copyright © Kluwer 1994 

References

Chuvaev, K.K., Oknyanskij, V.L., 1989, Sov. Astron. Vol. 33, p.1 Google Scholar
Lyutyi, V.M., Oknyanskij, V.L., Chuvaev, K.K., 1984, Sov. Astron. Lett. vol. 10, p.335 Google Scholar
Lytyi, V.M.: 1977, Astron. Zhurn. vol. 54, p.1153 Google Scholar
Oknyanskij, V.L., Lyutyi, V.M., Chuvaev, K.K., 1991, Sov. Astron. Lett. vol. 17, p.100 Google Scholar
Oknyanskij, V.L., 1993, Pis'ma v Astron. Zhurn. vol. 19, N 11, p.1021 Google Scholar
Penston, M.V., Perez, E., 1984 MNRAS vol. 211, 33P CrossRefGoogle Scholar