Long-term optical colour and spectral index variability of OJ287

Details Long-term optical colour and spectral index variability of OJ287 Long-term optical colour and spectral index variability of OJ287

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...218...45t&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 218, no. 1-2, July 1989, p. 45-48.

Astronomy and Astrophysics

Astrophysics

22

Astronomical Photometry, Bl Lacertae Objects, Color, Light Curve, Magnitude, Ubv Spectra, Variability

Scientific paper

The paper presents the first evidence for a long term optical color and spectral index variability in the BL Lac source OJ287. Since the large optical outburst in 1972, its B-V color index has changed from 0.36 to 0.7. Most of this change has been slow linear development, but after the outburst in 1983 B-V has changed much faster; from 0.46 in 1983 to 0.7 at present. At the same time the optical spectral index has changed from -0.8 to -2.0. Both B-V and the spectral index show also a correlation with the V magnitude, in the sense that when OJ287 is fainter, B-V is larger and the spectrum steeper.

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