Quasi-simultaneous optical and UV observations of OJ 287 during an active period in 1983

Details Quasi-simultaneous optical and UV observations of OJ 287 during an active period in 1983 Quasi-simultaneous optical and UV observations of OJ 287 during an active period in 1983

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...127l..17m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 127, no. 2, Nov. 1983, p. L17, L18.

Astronomy and Astrophysics

Astronomy

7

Bl Lacertae Objects, Spectrophotometry, Ultraviolet Spectra, Visible Spectrum, Far Ultraviolet Radiation, Interstellar Extinction, Iue, Spaceborne Astronomy

Scientific paper

Far UV spectra (1200 - 3000 Å) of OJ 287 were taken with IUE on Feb. 15th, 1983. Optical spectrophotometry (4500 - 7800 Å) was obtained three days later with the 1.8 m telescope of the Asiago Observatory. The source was in an intermediate state, mV ≅ 14, between quiescence and the maximum reported in January (mV ≅ 13). A power law (Fν ∝ ν-α) best fit of the UV spectra with the interstellar absorption as an additional free parameter yields αUV = 1.45±0.05 and AV = 0.1±0.05. For the optical spectrum with AV = 0.1, the best fit spectral index is αopt = 0.70±0.15, indicating a pronounced spectral steepening between the two ranges, Δα = 0.75±0.15.

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