Spectral Variability of NGC 4151 in 1972–1991
| Autor: | V. M. Lyutyi, K. K. Chuvaev, V. L. Oknyanskij |
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| Rok vydání: | 1994 |
| Předmět: | |
| Zdroj: | Symposium - International Astronomical Union. 159:401-401 |
| ISSN: | 0074-1809 |
| Popis: | 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). |
| Databáze: | OpenAIRE |
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