Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987azh....64..465l&link_type=abstract
Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 64, May-June 1987, p. 465-475. In Russian.
Astronomy and Astrophysics
Astronomy
18
Astronomical Spectroscopy, Galactic Nuclei, Periodic Variations, Radiant Flux Density, Seyfert Galaxies, Ubv Spectra, Amplitudes, Astronomical Photography, Electrophotometry, Light Curve, Spectrum Analysis
Scientific paper
The analysis of the photoelectric (1967 - 1984, ≡420 UBV measurements) and photographic (1906 - 1982, ≡560 measurements) observations of the nucleus of the Seyfert galaxy NGC 4151 is carried out. All observations are reduced to a uniform photometric system. The multi-component structure of the light curve is emphasized: there are variabilities with timescales from tens of days to tens of years. All components except the slowest (≡80 years) ones are quasi-periodic, or cyclic. The period search analysis does not show any periodicities from 35 days to 20 years, both for photoelectric (≡18 years) and photographic (≡80 years) observations. Only the first half of the photoelectric set shows the 130-day periodicity (25 cycles). The amplitude of the fast component (the flux) is proportional to that of the slow component.
Lyutyj V. M.
Oknyanskij V. L.
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