New southern radio binaries
Open Access
- 1 June 1984
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 208 (4) , 865-871
- https://doi.org/10.1093/mnras/208.4.865
Abstract
Observations with the Parkes 64-m telescope in 1982 and 1983 have resulted in the detection of eight new southern radio binaries, six of which are believed to be RS CVn binaries. The peak 5-GHz luminosities of three of these stars exceed 1010 W Hz−1 sr−1 and equal the extreme values measured for one or two northern binaries. For a source diameter equal to that of the cooler active giant or sub-giant component, the derived peak brightness temperatures of ∼ 1010 K for two stars are probably inconsistent with the incoherent synchrotron emission mechanism, especially if the emission is strongly circularly polarized. An electron-cyclotron maser appears to be a possible alternative emission mechanism, but there may be difficulties with such a model if the source is as large as the diameter of the active component.Keywords
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