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Photometric variability of 14 PMS stars in the NGC 7000/IC 5070 complex
Sunay I. Ibryamov, Evgeni H. Semkov
New photometric data from CCD multicolour BVRI observations of 14 pre-main sequence stars during the period from 2013 April to 2015 September are presented. The studied objects are…
Optical-NIR variability of blazars on diverse timescales
A. Agarwal, A. C. Gupta
To search for optical variability on a wide range of timescales, we have carried out photometric monitoring of 3C 454.3, 3C 279 and S5 0716+714. CCD magnitudes in B, V, R and I pas…
The PMS star V1184 Tau (CB 34V) at the end of prolonged eclipse
E. H. Semkov, S. P. Peneva, S. I. Ibryamov
V1184 Tau (CB 34V) lies in the field of the Bok globule CB 34 and was discovered as a large amplitude variable in 1993. According to the first hypothesis of the variability of the…
First NuSTAR Observations of Mrk 501 within a Radio to TeV Multi-Instrument Campaign
A. Furniss, K. Noda, S. Boggs +273
We report on simultaneous broadband observations of the TeV-emitting blazar Markarian 501 between 1 April and 10 August 2013, including the first detailed characterization of the s…
Optical and Radio Variability of BL Lacertae
Haritma Gaur, Alok C. Gupta, R. Bachev +17
We observed the prototype blazar, BL Lacertae, extensively in optical and radio bands during an active phase in the period 2010--2013 when the source showed several prominent outbu…
Nature of Intra-night Optical Variability of BL Lacertae
Haritma Gaur, Alok C. Gupta, R. Bachev +13
We present the results of extensive multi-band intra-night optical monitoring of BL Lacertae during 2010--2012. BL Lacertae was very active in this period and showed intense variab…