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The Interaction of the Eta Carinae Primary Wind with a Century Old Slow Equatorial Ejecta | | Noam Soker
; Amit Kashi
; | | Date: |
6 Nov 2011 | | Abstract: | We argue that the asymmetric morphology of the blue and red shifted
components of the outflow at hundreds of AU from the massive binary system
$eta$ Carinae can be understood form the collision of the primary stellar wind
with the slowly expanding dense equatorial gas. Recent high spatial
observations of some forbidden lines, e.g. [Fe III] $lambda$4659, reveal the
outflowing gas within about one arcsecond ($2300 AU$) from $eta$ Car. The
distribution of the blue and red shifted components are not symmetric about the
center, and are quite different from each other. The morphologies of the blue
and red shifted components correlate with the location of a dense slowly moving
equatorial gas (termed the Weigelt blobs environment; WBE), that is thought to
have been ejected during the 1887 -- 1895 Lesser Eruption (LE). In our model
the division to the blue and red shifted components is caused by the postshock
flow of the primary wind on the two sides of the equatorial plane after it
collides with the WBE. The fast wind from the secondary star plays no role in
our model for these components, and it is a freely expanding primary wind that
collides with the WBE. Because the line of sight is inclined to the binary
axis, the two components are not symmetric. We show that the postshock gas can
also account for the observed intensity in the [Fe III] $lambda$4659 line. | | Source: | arXiv, 1111.1454 | | Services: | Forum | Review | PDF | Favorites | |
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