Optical behaviour of 8 BL Lac objects and the properties of their central nucleus

Details Optical behaviour of 8 BL Lac objects and the properties of their central nucleus Optical behaviour of 8 BL Lac objects and the properties of their central nucleus

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26as...72..163x&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 72, no. 1, Jan. 1988, p. 163-169.

Astronomy and Astrophysics

Astrophysics

54

Astronomical Photometry, Bl Lacertae Objects, Charge Coupled Devices, Galactic Nuclei, Optical Properties

Scientific paper

CCD image photometry results for 8 BL Lac objects have been obtained at Yunnan Observatory. The main results show that: (1) BL Lac has a very short characteristic timescale of about 80 min with an amplitude of Delta B of about 0.6 mag; (2) Mark 421 has a short timescale variability of about 2.5 hours with an amplitude of Delta B of about 1.4 mag; and (3) 0109 + 22 has a rapid optical variation whose amplitude exceeds 0.68 mag in about 70 min.

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