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- W156619170 abstract "Penfold's UBV observations of the Nuclei of the Seyfert galaxies NGC 1566, NGC 3227, NGC 3783, NGC 6814, NGC 7469, Mk 50 and IC 4329A are examined to look for a possible periodicity in the variation of the magnitudes and colors. A method based on the fitting of sinusoidals and the calculation of the multiple correlation coefficient adequated to the analysis of observations unequally spaced in time is used to analyse the data. Four of the seven galaxies studied show a high probability of having periodic component in the variation. Recent UBV observations were used to test the components in two of them." @default.
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- W156619170 date "1987-01-01" @default.
- W156619170 modified "2023-09-24" @default.
- W156619170 title "A Search for Periodicities in the Light Variation of Some Seyfert Galaxies" @default.
- W156619170 cites W1996512536 @default.
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- W156619170 doi "https://doi.org/10.1017/s0074180900155093" @default.
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