VLA observations of the eclipsing binary system AR Lacertae

Details VLA observations of the eclipsing binary system AR Lacertae VLA observations of the eclipsing binary system AR Lacertae

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aj.....89..430d&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 89, March 1984, p. 430-432.

Astronomy and Astrophysics

Astronomy

19

Bremsstrahlung, Circular Polarization, Eclipsing Binary Stars, Light Curve, Radio Astronomy, Stellar Radiation, Synchrotron Radiation, X Ray Astronomy

Scientific paper

Dual-frequency radio observations of the RS CVn binary system AR Lacertae are reported during two secondary eclipses. No clearly defined eclipse signature was observed during either eclipse at either 1.5 or 4.9 GHz. This implies a lower limit of 5×1011 cm for the source diameter if the source is located in the orbital plane. Significant circular polarization (2% - 8%) was observed on both days, with a helicity reversal between 1.5 and 4.9 GHz. This polarization signature is consistent with a gyro-synchrotron emission mechanism if the source becomes optically thick between 1.5 and 4.9 GHz. Using this emission model, the derived range of magnetic field strength is 5 ⪉ B ⪉ 80 G.

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