CCD brightness monitoring of the twin QSO 0957 + 561

Details CCD brightness monitoring of the twin QSO 0957 + 561 CCD brightness monitoring of the twin QSO 0957 + 561

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...277..481s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 277, Feb. 15, 1984, p. 481-484.

Astronomy and Astrophysics

Astrophysics

16

Astronomical Photometry, Brightness Distribution, Charge Coupled Devices, Quasars, Data Reduction, Optical Correction Procedure

Scientific paper

The present study is concerned with an optical monitoring of the brightness of the two images of the twin QSO Q0957 + 561 during the time from 1979 through 1982 December in the R photometric band. Monitoring activities conducted with CCD cameras began shortly after the discovery that the twin QSO 0957 + 561 is a gravitationally lensed object. Attention is given to a data analysis, R band data corrections, and the observed brightness variations. The obtained data for the B/A brightness ratio suggest that a large increase occurred in the first half of 1980, followed by an abrupt decrease in 1980 December. There appears to have been only a steady decline in 1982 in the B/A brightness ratio. The data confirm the trend noted by Keel (1982).

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