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- W2071027188 abstract "In this paper, we compute theoretically the flux density and the spectral index of the free-free radiation at radio wavelengths produced by shocks in the inner bipolar emission nebula called the little Homunculus around the star η Carinae. The little Homunculus is believed to have formed as a result of the minor eruption suffered by the star in the 1890s. In our model, we consider a simplified interacting stellar wind scenario where the post-outburst η Carinae wind collides with the eruptive outflow (both assumed to be bipolar with conical symmetry). As a result of the interaction, shock-wave structures are formed and generate the development of two polar caps moving in opposite directions. After ∼100 yr (i.e. at present times), the polar caps are located ±2.3 arcsec on each side of the star, and remain embedded within the larger bipolar Homunculus that extends from -8 to +8 arcsec along its major axis. Using observational estimates of the characteristics of the eruptive event of the 1890s, and of the ambient wind powered by η Carinae in the decades after the eruption ended, we study the evolution of the polar caps formed as a result of a sudden increase in the wind velocity and an instantaneous drop in the mass-loss rate (just after the eruption) at the injection radius. We found that the little Homunculus emits continuum radiation that can be detected at radio frequencies and that indeed represents an important contribution to the total free-free emission detected from the η Carinae nebula." @default.
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- W2071027188 date "2006-11-21" @default.
- W2071027188 modified "2023-09-25" @default.
- W2071027188 title "Predicted radio-continuum emission from the little Homunculus of the Carinae nebula" @default.
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- W2071027188 doi "https://doi.org/10.1111/j.1365-2966.2006.11055.x" @default.
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