Optical monitoring of southern quasars. I - Data reduction and first results

Details Optical monitoring of southern quasars. I - Data reduction and first results Optical monitoring of southern quasars. I - Data reduction and first results

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.187..389g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 187, May 1979, p. 389-402.

Astronomy and Astrophysics

Astronomy

10

Data Reduction, Light Curve, Quasars, Scaling, Black Body Radiation, Spectrum Analysis, Variability

Scientific paper

A systematic programme to monitor optical activity in southern quasars was begun by the author in 1975, and is continuing. Because observations are in a nonstandard (S20R) filter system, data reduction involves scaling observed iris photometer readings to plate-independent values. The relation between observed comparison star readings and a weighted mean value for each star is used to scale the quasar iris readings to a plate-independent but non-Pogson measure of apparent magnitude. This can be used to define variability into five groups. These are: rapid, large variations; rapid, small variations; slow, large variations; slow, small variations and no detected variations. An example of each type of light curve is presented.

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