Resumo

CONTRERAS, M. E.; MONTES, G.  e  WILKIN, F. P.. Very large array observations of winds from massive stars. Rev. mex. astron. astrofis [online]. 2004, vol.40, n.1, pp.53-60. ISSN 0185-1101.

The classical model for free-free emission from ionized stellar winds is based on the assumption of a stationary, isotropic and homogeneous wind. However, since there exist objects whose wind behavior deviates from the standard model, these assumptions have been questioned in the last decade. In this work, we present results for 3 bright sources: P Cyg (B1Ia, LBV), Cyg OB2 No. 12 (B5Ie, LBV?) and WR 147 (WN8h+B0.5V). These hot massive objects have been reported to possess winds that deviate from the basic assumptions. We have obtained radio flux densities, sizes, spectral indices and mass loss rates for each of the targets. These parameters allow us to analyze possible asymmetries, inhomogeneities and time variations in the flux densities. These features confirm the nonclassical behaviour of the winds of these hot massive stars.

Palavras-chave : Stars [Early-type]; Stars [Individual (WR147, P Cygni, Cygnus OB2 No. 12)]; Stars [Mass loss]; Stars [Wolf-Rayet].