Astrophys. J., 705, 899-906 (2009/November-1)
Disentangling the nature of the radio emission in Wolf-Rayet stars.
MONTES G., PEREZ-TORRES M.A., ALBERDI A. and GONZALEZ R.F.
Abstract (from CDS):
We present quasi-simultaneous, multi-frequency Very Large Array observations at 4.8, 8.4, and 22.5 GHz of a sample of 13 Wolf-Rayet (WR) stars, aimed at disentangling the nature of their radio emission and the possible detection of a non-thermal behavior in close binary systems. We detected 12 stars from our sample, for which we derived spectral information and estimated their mass-loss rates. From our data, we identified four thermal sources (WR 89, 113, 138, and 141), and three sources with a composite spectrum (similar contribution of thermal and non-thermal emission; WR 8, 98, and 156). On the other hand, from the comparison with previous observations, we confirm the non-thermal spectrum of one (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 nature of the emission for the observed objects.
binaries: close - radio continuum: stars - stars: individual (WR 98, WR 133, WR 156) - stars: Wolf-Rayet
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