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A Search for Periodicities in the Light Variation of Some Seyfert Galaxies

Published online by Cambridge University Press:  04 August 2017

S.M. Bisch ,
M.G. Pastoriza ,
H. Dottori  and
I. Busko
S.M. Bisch
Affiliation:
Instituto de Física, UFRGS Av. Bento Gonçalves, 9500 90.000 Porto Alegre, RS Brasil
M.G. Pastoriza
Affiliation:
Instituto de Física, UFRGS Av. Bento Gonçalves, 9500 90.000 Porto Alegre, RS Brasil
H. Dottori
Affiliation:
Instituto de Física, UFRGS Av. Bento Gonçalves, 9500 90.000 Porto Alegre, RS Brasil
I. Busko
Affiliation:
Instituto de Física, UFRGS Av. Bento Gonçalves, 9500 90.000 Porto Alegre, RS Brasil

Abstract

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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.

Type
IV. Variability
Information
Symposium - International Astronomical Union , Volume 121: Observational Evidences of Activity of Galaxies , 1987 , pp. 185 - 190
Copyright
Copyright © Reidel 1987 

References

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