Abstract
We report on a long-term program designed to investigate the spatial structure of centimeteric radio emission from close binary systems using multi-station VLBI arrays. We have detected eleven binaries, including eight RS CVn systems, Algol, LSI 61°303, and Cyg X-l. The measured brightness temperatures vary from TB ~ 108.5 K during periods of low activity to TB ~ 1010.5 K during flares. Extensive observation of a few sources has shown that the spatial structure is ‘core-halo’ with linear dimensions of about a stellar radius and the binary system, respectively. The observations are consistent with gyrosynchrotron emission of mildly relativistic electrons (<E> ~ 1 - 5 MeV) in magnetic fields of B ~ 101.5±0.5 gauss. The core sources appear to be optically thick, while the halo component is optically thin.
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Lestrade, JF., Mutel, R.L., Preston, R.A., Phillips, R.B. (1985). High-Angular Resolution Observations of Stellar Binary Systems. In: Hjellming, R.M., Gibson, D.M. (eds) Radio Stars. Astrophysics and Space Science Library, vol 116. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5420-5_40
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DOI: https://doi.org/10.1007/978-94-009-5420-5_40
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