Periodicity of the Seyfert galaxy NGC 4151 in the optical

Details Periodicity of the Seyfert galaxy NGC 4151 in the optical Periodicity of the Seyfert galaxy NGC 4151 in the optical

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26as...31..383b&link_type=abstract

Astronomy and Astrophysics Supplement Series, vol. 31, Mar. 1978, p. 383-388.

Astronomy and Astrophysics

Astrophysics

16

Astronomical Photometry, Luminous Intensity, Periodic Variations, Seyfert Galaxies, Ubv Spectra, Electrophotometry, Light Curve, Tables (Data), Variability

Scientific paper

Results of an analysis of the optical variability of the Seyfert galaxy NGC 4151 are presented. A homogeneous set of photoelectric UBV observations obtained for about eight years (1968-1975) has been analyzed. The light variations have been divided into slowly and rapidly varying components. A 130-day period was found for the 'rapid' component using a modification of the trial period method introduced by Jurkevich. Mean light curves were obtained in all three colors. A pulse about 70 days in duration with an amplitude of 0.8 mag in the U band was found to be the characteristic feature of the 130-day period.

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