Abstract
We present preliminary results of the optical observations of BL Lacertae during the period from Aug 1997 to Aug 1998 carried out with ST-6 CCD 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, intranight and intrahour variability of BL Lacertae. They were studied on the bases of 172 nights of observations, while the long-term variability during 183 nights. The maximum variation is observed in B band and equals to 3.00 (rms=0.03). The variations in the V and R bands are within 2.71 (0.02) and 2.53 (0.01), respectively. This means that variations are larger at shorter wavelength or the object become bluer in the active phase. It were also demonstrated that BL Lacertae shows the short time scale variability in R band within 0.30 (0.02) and 0.10 (0.01).
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
