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Abstract: We present quasi-simultaneous, multi-frequency VLA observations at 4.8, 8.4,and 22.5 GHz, of a sample of 13 Wolf Rayet WR stars, aimed at disentanglingthe nature of their radio emission and the possible detection of a non-thermalbehavior in close binary systems. We detected 12 stars from our sample, forwhich we derived spectral information and estimated their mass loss rates. Fromour data, we identified four thermal sources WR 89, 113, 138, and 141, andthree sources with a composite spectrum similar contribution of thermal andnon-thermal emission; WR 8, 98, and 156. On the other hand, from thecomparison with previous observations, we confirm the non-thermal spectrum ofone WR 105, and also found evidence of a composite spectrum for WR 79a, 98a,104, and 133. Finally, we discuss the possible scenarios to explain the natureof the emission for the observed objects.

Autor: Gabriela Montes, Miguel A. Perez-Torres, Antxon Alberdi, Ricardo F. Gonzalez

Fuente: https://arxiv.org/

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