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For refcode 1992MNRAS.257..659W:
Retrieve 35 NED objects in this reference.
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NED Abstract

Copyright by Royal Astronomical Society. 1992MNRAS.257..659W Variability studies of Seyfert galaxies - I. Broad-band optical photometry H. Winkler, I. S. Glass, F. van Wyk, F. Marang, J. H. Spencer Jones, D. A. H. Buckley and K. Sekiguchi South African Astronomical Observatory, PO Box 9, Observatory, 7935, Cape Town, South Africa Department o[Astronomy. University of Cape Town, Private Bag, Rondebosch, 77000, South Africa Accepted 1992 February 19. Received 1992 February 12; in original form 1991 October 22 SUMMARY We present the results of a four-year campaign to monitor the variations of 35 southern Seyfert galaxies, using UBV(RI)_c_ multi-aperture photometry. Most of the galaxies are found to be variable. The light curves are displayed and some of their more interesting details are discussed. The relationship between the fluxes through different filters are well described by straight lines, which suggests that the spectral shape of the variable part of the optical continuum stays constant. The values of the slopes are used to derive the shapes of the continua, the extinctions and the luminosities of the Seyfert nuclei. It is shown that the nuclear flux in the optical is largely of thermal origin. The significance of the results to current models of Seyfert nuclei is discussed. Key words: galaxies: nuclei - galaxies: photometry - galaxies: Seyfert
Retrieve 35 NED objects in this reference.
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