Optical polarimetry of quasi-stellar and BL Lac objects

Details Optical polarimetry of quasi-stellar and BL Lac objects Optical polarimetry of quasi-stellar and BL Lac objects

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980aj.....85.1555w&link_type=abstract

Astronomical Journal, vol. 85, Dec. 1980, p. 1555-1558.

Astronomy and Astrophysics

Astronomy

34

Bl Lacertae Objects, Optical Polarization, Polarimetry, Quasars, Absorption Spectra, Calibrating, Emission Spectra, Extraterrestrial Radiation, Light (Visible Radiation), Red Shift

Scientific paper

Observations of 39 extragalactic objects, using a new polarimeter at McDonald Observatory, are reported. Most of the observations were made in January and June 1980. Some new BL Lac objects were found, and some of the previously known members of this class were also observed. Polarization exceeding 3-4 times the formal rms uncertainties was found in about ten QSO's. Rapid changes of polarization and/or position angle occurred in some of the BL Lacertae objects, usually with less than 0.1-mag change in the total light.

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