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VLBI Observations of WR Stars

Published online by Cambridge University Press:  03 August 2017

M. Felli  and
M. Massi
M. Felli
Affiliation:
Osservatorio Astrofisico di Arcetri, Florence, Italy
M. Massi
Affiliation:
Osservatorio Astrofisico di Arcetri, Florence, Italy

Abstract

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We present the first VLBI radio observations of two WR stars (WR140 and WR146) and of two early type stars (HD167971 and θ 1 ORI A). The derived size and brightness temperature suggest that in all cases the radio emission originates from two distinct components: a steady weak emission due to the ionized wind of the primary and a smaller diameter brighter non-thermal component, probably associated to a small region within the ionized envelope of the star.

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