Non-thermal emission in Wolf-Rayet stars: are massive companions required?

Details Non-thermal emission in Wolf-Rayet stars: are massive companions required? Non-thermal emission in Wolf-Rayet stars: are massive companions required?

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.319.1005d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 319, Issue 4, pp. 1005-1010.

Astronomy and Astrophysics

Astronomy

76

Stars: Individual: Wr86, Stars: Wolf-Rayet, Radio Continuum: Stars

Scientific paper

We examine the radio spectral indices of 23 Wolf-Rayet (WR) stars to identify the nature of their radio emission. We identify nine systems as non-thermal emitters. In seven of these systems the non-thermal emission dominates the radio spectrum, while in the remaining two it is of comparable strength to the thermal, stellar wind emission, giving `composite' spectra. Among these nine systems, seven have known spectroscopic or visual binary companions. The companions are all massive O or early B-type stars, strongly supporting a connection between the appearance of non-thermal emission in WR stars and the presence of a massive companion. In three of these binaries, the origin of non-thermal emission in a wind-collision region between the stars has been well established in earlier work. The binary systems that exhibit only thermal emission are all short-period systems where a wind-collision zone is deep within the opaque region of the stellar wind of the WR star. To detect non-thermal emission in these systems requires optically thin lines of sight to the wind-collision region.

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