The photometry of 0957 plus 561 - Detection of short-period variations

Details The photometry of 0957 plus 561 - Detection of short-period variations The photometry of 0957 plus 561 - Detection of short-period variations

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...110l..11v&link_type=abstract

Astronomy and Astrophysics, vol. 110, no. 2, June 1982, p. L11-L14. In French.

Astronomy and Astrophysics

Astrophysics

10

Astronomical Photometry, Gravitational Lenses, Light Curve, Periodic Variations, Quasars, Cross Correlation, Electronography, Time Lag

Scientific paper

Absolute photometry is necessary to determine the time delay Delta t between the two images A and B of the 'double' quasar 0957 plus 561, interpreted as a multiple gravitational image of a single quasar. Electronography was used to individually measure the images A and B with an accuracy of a few hundredths of magnitude; an amplitude of variation (in V color) of approximately 0.20 magnitude was found for both images over a 1.5-year period. In addition, the A/B flux ratio was found to vary by about 7 percent in three days (April 26-29, 1981) and 3 percent in 24 hours (April 29-30), the variations being identical in B and V. The practical possibility of determining Delta t by a photometric survey is discussed in the light of these results.

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