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Optical brightness monitoring of the twin QSO Q0957+561 A,B*

Published online by Cambridge University Press:  19 July 2016

R. Schild
R. Schild*
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138

Abstract

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The gravitationally lensed QSO 0957+561A,B has been monitored from 1979 to the present with CCD cameras. We believe that the arrival time difference is 1.2 ± 0.2 years.

Type
VI. Quasars as Probes of the Intervening Medium
Information
Symposium - International Astronomical Union , Volume 119: Quasars , 1986 , pp. 549 - 550
Copyright
Copyright © Reidel 1986