CCD photometric observations of blazars.

Details CCD photometric observations of blazars. CCD photometric observations of blazars.

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26as..114..337g&link_type=abstract

Astronomy and Astrophysics Supplement, v.114, p.337

Astronomy and Astrophysics

Astrophysics

5

Bl Lacertae Objects, Quasars

Scientific paper

The results of both BVRI CCD photometric monitoring and fast photometry in a certain optical waveband for 4 blazar objects and variable quasar are presented. The results show that 1) 3C 120 has a short time scale variability about 20 minutes, with the different shape of light curve and with different amplitude (one is 0.21+/-0.06mag, the other is 0.053+/-0.014mag) in different night. One day timescale variability was also observed, with a maximum decrease of the flux near 20%. 2) OJ 287 has a variability on a timescale of one day, with the maximum amplitude of changes about 0.2mag. Since 1990, the source brightened near 0.8mag. 3) 3C 345 is fainter during observing periods, the faintest magnitude B~17.5mag it seems variable from night to night. 4) The variability with a small amplitude about 0.1mag appear on a timescale of about 10 months in the data of PHL 658. The values of the colour index of the blazars in each night are given.

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