Journal
ASTRONOMY & ASTROPHYSICS
Volume 372, Issue 1, Pages L9-L12Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20010539
Keywords
eta Carinae; massive stars; LBV stars; mass loss
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Stellar winds emitted by rotating massive stars may show two main components: firstly bipolar lobes with low density and fast wind, produced by the higher T-eff and gravity at the poles (geff-effect); secondly, an equatorial disc with a slow dense wind, produced by the stronger opacities at the equator (k-effect). To see the possible role of this anisotropic wind on the shape of LBV nebulae, we calculate the distribution of the ejected matter in 2 simplified cases: 1) A brief shell ejection. We find that prolate and peanut-shaped hollow nebulae naturally form due to the g(eff)-effect in rotating stars. 2) A constant wind for a long time. This produces prolate filled nebulae, with a possible strong disc when a bi-stability limit is crossed in the equatorial region. Thus, many features of the eta Carinae and LBV nebulae are accounted for by the anisotropic ejection from rotating stars.
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