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Optical Variability of Twenty-Two Quasi-Stellar Objects

Published online by Cambridge University Press:  14 August 2015

R. J. Angione  and
H. J. Smith
R. J. Angione
Affiliation:
University of Texas, Austin, Texas, U.S.A.
H. J. Smith
Affiliation:
University of Texas, Austin, Texas, U.S.A.

Abstract

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Light fluctuations have been found in all 22 QSOs studied by measurement of plates from the Harvard collection, which cover the last eighty years. The conclusions of this study are: (i) There appear to be at least three general classes of variation: (a) erratic, small-amplitude variations, (b) erratic, large-amplitude variations, and (c) slow quasi-periodic variations, e.g. as in 3C 273; (ii) No significant differences were detected between the rates of rise and decline of luminosity; (iii) Definite secular trends over at least 50 years were found in 5 QSOs; (iv) No simple clearcut periods greater than one year have been found; (v) There may be a trend of decreasing amplitude of fluctuations in apparent magnitude with increasing luminosity.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 44: External Galaxies and Quasi-Stellar Objects , 1972 , pp. 171 - 178
Copyright
Copyright © Reidel 1972 

References

Angione, R. J.: 1970, Dissertation, Astronomy Department, University of Texas at Austin (June, 1970); in preparation for publication.Google Scholar