Query : 2001A&A...372L...9M

2001A&A...372L...9M - Astronomy and Astrophysics, volume 372, L9-12 (2001/6-2)

The shape of η Carinae and LBV nebulae.


Abstract (from CDS):

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 Teff and gravity at the poles (``geff-effect''); secondly, an equatorial disc with a slow dense wind, produced by the stronger opacities at the equator (``κ-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 geff-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 η Carinae and LBV nebulae are accounted for by the anisotropic ejection from rotating stars.

Abstract Copyright:

Journal keyword(s): A|"CDS/simbad/smb.query.id "@3201912" "Name=@3201912" submit=submit null|η Car">{η Carinae} - massive stars - LBV stars - mass loss

CDS comments: in ref list Kwok 1978ApJ...219L.125K instead of ApJ...210

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 NAME Homunculus Nebula ISM 10 45 03.5 -59 41 04           ~ 333 1
2 * eta Car Em* 10 45 03.545808 -59 41 03.95124 6.37 7.03 6.48 4.90 4.41 OBepec 2278 0

    Equat.    Gal    SGal    Ecl

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