OJ 287 - Polarization and photometric behavior during 1971-76

Details OJ 287 - Polarization and photometric behavior during 1971-76 OJ 287 - Polarization and photometric behavior during 1971-76

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980ap%26ss..73..263g&link_type=abstract

Astrophysics and Space Science, vol. 73, no. 2, Dec. 1980, p. 263-277. Translation.

Astronomy and Astrophysics

Astrophysics

34

Astronomical Photometry, Bl Lacertae Objects, Polarimetry, Polarization (Waves), Luminous Intensity, Polarized Electromagnetic Radiation, Synchrotron Radiation, Tables (Data), Ubv Spectra

Scientific paper

Results are given of polarimetric and photometric observations of BL Lacertae-type object OJ 287 for 1972-76. These, and all other data available from the literature, are used in a comparative analysis of polarimetric and photometric properties of the object. The variations of time-scales from several years to several hours are noted. The variability is caused by the flaring up and fading of separate sources (hot spots) of polarized (synchrotron) radiation. The existence of a preferable direction of polarization (theta zero = 80 deg) is an indication of a stable magnetic field. It may be used as an argument in favor of the single-body hypothesis of Lacertids. The behavior of OJ 287 during a 6-day interval may be explained by intensity changes of a single source with constant parameters of polarization. It is found that, for this source, p = 42.8%, theta zero = 101 deg. The night variations of brightness and parameters of polarization limit the dimensions of the source responsible for this variability (R is equal to or less than 5 x 10 to the 14th cm) and make it possible to estimate its degree of polarization (p = 50%).

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