VLA detection of radio emission from a dwarf nova

Details VLA detection of radio emission from a dwarf nova VLA detection of radio emission from a dwarf nova

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...218..137b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 218, no. 1-2, July 1989, p. 137-140.

Astronomy and Astrophysics

Astrophysics

5

Cataclysmic Variables, Dwarf Novae, Radio Emission, Stellar Radiation, Very Large Array (Vla), Circular Polarization, Eclipsing Binary Stars, Masers, Nonthermal Radiation, Stellar Magnetic Fields

Scientific paper

Radio emission was detected at 4.9 GHz from a dwarf nova for the first time with the Very Large Array. This confirms earlier reports based on single or binary dish observations. Radio emission in only one out of eight dwarf novae was detected. The radio source is EM Cyg, an eclipsing binary system. It is variable on the scale of days and is circularly polarized. EM Cyg had an optical outburst, but was not eclipsed during the observations. If interpreted by synchrotron emission the observed radiation requires a source size larger than the binary separation and relatively large magnetic fields. Maser emission of nonthermal electrons reflected in the magnetic field of the white dwarf is a possibly more attractive alternative. A source field of 800-2000 Gauss then is required depending on the most efficient maser mode.

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