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BL Lacertae: long-term, intraday and intrahour variability

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We present preliminary results of the optical observations of BL Lacertae during the period June-November 2001 carried out using an ST-6 charge-coupled device camera attached to the Newtonian focus of the 70 cm meniscus telescope of the Abastumani Observatory. The aim of these observations is to study the long-term variability, intranight variability and intrahour variability of BL Lacertae.

The overall long-term variation in the R band has a magnitude of 1.80 (rms, 0.03). We also demonstrated that the typical average amplitudes of the intraday variability and the intrahour variability in the R band are of magnitudes 0.30 ± 0.02 and 0.10 ± 0.01 respectively. The maximum amplitudes of both types of variation are of magnitude 0.40 ± 0.02.
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Keywords: Active galaxies; BL Lacertae; Quasars

Document Type: Research Article

Affiliations: 1: Abastumani Observatory 383762 Abastumani Georgia 2: Astrophysical Institute of Potsdam An der Sternwarte 16 D-14482 Potsdam Germany

Publication date: 2003-08-01

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