Fast variability of BL Lacertae at 1mum

Details Fast variability of BL Lacertae at 1mum Fast variability of BL Lacertae at 1mum

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.299...47m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 299, Issue 1, pp. 47-50.

Astronomy and Astrophysics

Astronomy

24

Bl Lacertae Objects: Individual: Bl Lacertae, Galaxies: Photometry

Scientific paper

We present the results of photometric observations of BL Lacertae at 1 μm performed during the strong outburst that occurred in the summer of 1997. Measurements were carried out using the F99 filter of the Arizona system. Simultaneous observations in the BV bands were made with other telescopes. Large and fast variations were observed on the night of August 2 when the brightness of BL Lacertae changed by ~0.5 mag in about 2 h: the variation amplitude is greater at higher frequency. Some implications of these results for the origin of the fast variations are discussed. We also report the first F99 calibration for three reference stars in the BL Lac field.

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