Radio Emission Of The O-star Binary System Cyg Ob2 #5

Astronomy and Astrophysics – Astronomy

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Scientific paper

The radio emission from the 6.6-day O7+O7 binary system Cyg OB2 #5 has been shown previously to vary with a period of 7 years. The location and scale of the variability has been unclear since the discovery of a non-thermal source 0.8" to the NE of the binary. This source (NE) was tentatively identified as a wind-collision region between the winds of the massive binary and that of a BO star 0.9" from the binary. Fifty epochs of VLA observations spanning 20 years have been reexamined using state of the art techniques to determine the emission arising from both the binary and NE with the aim of determining the location and nature of the variable radio emission. It is shown that the variations are associated with the binary system. A number of mechanisms that may give rise to this emission are described.

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