Abstract. | We present V RcIc Johnson-Cousins magnitudes of eld comparison stars for twelve BL Lacertae objects belonging to the largest sample of blazars which is monitored at the Perugia University Observatory. The sequences reported here can be used in the long{term CCD photometric monitoring of BL Lac objects aimed to understand the characteristics of their variability. Finding charts for all of these comparison sequences are also included in this paper. Key words: BL Lacertae objects: genera
We present a catalogue of 233 BL Lacertae objects compiled through an extensive bibliographic search...
Context. Deep optical surveys open the avenue for finding large numbers of BL Lac objects ...
In 2021 BL Lacertae underwent an extraordinary activity phase, which was intensively followed by the...
Abstract. Seven BL Lac objects have been photometri-cally observed in an eort to study the dierence ...
This thesis reports the results of an environmental study of seventeen BL Lacertae objects (BL Lacs...
BL Lacertae objects\u27 (BL Lacs) relativistic jets are oriented close to our line of sight, produci...
We present optical observations of BL Lacertae (BL Lac) in the standard BVRI bands with the 80 cm Ts...
Photometric observations of AGNs are important to construct light curves and to study variability be...
The results of optical photometric $(BVRI)$ monitoring of three BL Lac objects over a time interval ...
We present a sample of 347 BL Lacertae (BL Lac) candidates identified from 2600 deg^2 of the Sloan D...
We present the optical (V, R, and I) photometry for BL Lacertae, which was observed from 1997 throug...
A comprehensive temporal analysis has been performed on optical light curves of BL Lacertae in the a...
Context. Observations of the γ-ray sky with Fermi led to significant advances towards understanding ...
Context. We extensively observed the prototype blazar, BL Lacertae, in optical and radio bands durin...
We present optical data in the Johnson's BV and Cousins' R bands for eight X-ray selected BL Lacerta...
We present a catalogue of 233 BL Lacertae objects compiled through an extensive bibliographic search...
Context. Deep optical surveys open the avenue for finding large numbers of BL Lac objects ...
In 2021 BL Lacertae underwent an extraordinary activity phase, which was intensively followed by the...
Abstract. Seven BL Lac objects have been photometri-cally observed in an eort to study the dierence ...
This thesis reports the results of an environmental study of seventeen BL Lacertae objects (BL Lacs...
BL Lacertae objects\u27 (BL Lacs) relativistic jets are oriented close to our line of sight, produci...
We present optical observations of BL Lacertae (BL Lac) in the standard BVRI bands with the 80 cm Ts...
Photometric observations of AGNs are important to construct light curves and to study variability be...
The results of optical photometric $(BVRI)$ monitoring of three BL Lac objects over a time interval ...
We present a sample of 347 BL Lacertae (BL Lac) candidates identified from 2600 deg^2 of the Sloan D...
We present the optical (V, R, and I) photometry for BL Lacertae, which was observed from 1997 throug...
A comprehensive temporal analysis has been performed on optical light curves of BL Lacertae in the a...
Context. Observations of the γ-ray sky with Fermi led to significant advances towards understanding ...
Context. We extensively observed the prototype blazar, BL Lacertae, in optical and radio bands durin...
We present optical data in the Johnson's BV and Cousins' R bands for eight X-ray selected BL Lacerta...
We present a catalogue of 233 BL Lacertae objects compiled through an extensive bibliographic search...
Context. Deep optical surveys open the avenue for finding large numbers of BL Lac objects ...
In 2021 BL Lacertae underwent an extraordinary activity phase, which was intensively followed by the...