BVRI photometry of BL Lacertae in 1993-1995

Details BVRI photometry of BL Lacertae in 1993-1995 BVRI photometry of BL Lacertae in 1993-1995

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26as..122..267m&link_type=abstract

A & A Supplement series, Vol. 122, April II 1997, 267-270.

Astronomy and Astrophysics

Astronomy

24

Bl Lacertae Objects: General, Bl Lacertae: Individual: Bl Lac

Scientific paper

The results of optical photometry of BL Lac over a time interval of two years in the B, V, R, I filters are presented. The source is found for most of the time in a low state. The mean colour indexes are similar to those observed in higher luminosity states, however a flattening of the spectral slope was present during three small amplitude outbursts. A brief comparison with the observations available in the literature and some considerations on the physical conditions driving the appearance of emission lines are made.

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