Gasdynamical Simulations of the Large and Little Homunculus Nebulae of η Carinae

@article{Gonzalez2004GasdynamicalSO,
  title={Gasdynamical Simulations of the Large and Little Homunculus Nebulae of $\eta$ Carinae},
  author={Ricardo F. Gonz'alez and E. Gouveia dal Pino and Alejandro C. Raga and Pablo F. Vel'azquez},
  journal={The Astrophysical Journal},
  year={2004},
  volume={600}
}
Here we present two-dimensional, time-dependent radiatively cooling hydrodynamical simulations of the large and little Homunculus nebulae around η Carinae. We employ an alternative scenario to previous interacting stellar wind models that is supported by both theoretical and observational evidence, where a nonspherical outburst wind (with a latitudinal velocity dependence that matches the observations of the large Homunculus), which is expelled for 20 years, interacts with a preeruptive slow… Expand

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References

SHOWING 1-10 OF 22 REFERENCES
On the Formation of the Homunculus Nebula around η Carinae
We have constructed an interacting winds scenario to account for the geometric and kinematic properties of the Homunculus in η Carinae as seen in recent Hubble Space Telescope observations. WindsExpand
The homunculus of Eta Carinae: An interacting stellar winds paradigm
We simulate the origin and evolution of the bipolar nebula surrounding Eta Car using numerical two-dimensional gasdynamic models. The generalized interacting stellar winds scenario, wherein a stellarExpand
Giant Outbursts of Luminous Blue Variables and the Formation of the Homunculus Nebula around η Carinae
The observed giant outbursts of luminous blue variables (LBVs) may occur when these massive stars approach their Eddington limits. When this happens, they must reach a point at which the centrifugalExpand
Dissecting the Homunculus nebula around Eta Carinae with spatially resolved near-infrared spectroscopy
Near-infrared emission lines are unique diagnostics of the geometry, structure, kinematics, and excitation of the circumstellar ejecta of η Carinae, and give clues to the nature of its wind. TheExpand
The departure of η Carinae from axisymmetry and the binary hypothesis
I argue that the large-scale departure from axisymmetry of the η Carinae nebula can be explained by the binary star model of η Carinae. The companion diverts the wind blown by the primary star, byExpand
Latitude-dependent Effects in the Stellar Wind of η Carinae
The Homunculus reflection nebula around η Carinae provides a rare opportunity to observe the spectrum of a star from more than one direction. In the case of η Car, the nebula's geometry is known wellExpand
THE PRECESSION OF THE GIANT HH 34 OUTFLOW: A POSSIBLE JET DECELERATION MECHANISM
The giant jets represent a fundamental trace of the historical evolution of the outflow activity over timescales of ~104 yr, i.e., a timescale comparable to the accretion time of the outflow sourcesExpand
Inhibition of Wind Compressed Disk Formation by Nonradial Line-Forces
We investigate the effects of nonradial line forces on the formation of a wind-compressed disk (WCD) around a rapidly rotating B star. Such nonradial forces can arise both from asymmetries in theExpand
A Supernova Remnant Collision with a Stellar Wind
Numerical simulations of the interaction between supernova ejecta and a stellar wind are presented. We follow the temporal evolution of the shock fronts that are formed through such an interactionExpand
Where is the Doughnut? Luminous Blue Variable Bubbles and Aspherical Fast Winds
In this paper, we address the issue of the origin of luminous blue variable (LBV) bipolar bubbles. Previous studies have explained the shapes of LBV nebulae, such as η Car, by invoking theExpand
...
1
2
3
...