The source of the helium visible lines in η Carinae

@article{Kashi2007TheSO,
  title={The source of the helium visible lines in $\eta$ Carinae},
  author={Amit Kashi and Noam Soker},
  journal={New Astronomy},
  year={2007},
  volume={12},
  pages={590-596}
}
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ORBITAL PARAMETERS FOR THE 250 M⊙ ETA CARINAE BINARY SYSTEM
We show that recent observations of He i and N ii lines of η Carinae may provide support for an orbital orientation where the secondary star is closest to us at periastron passages. This conclusion…
Precession and nutation in the η Carinae binary system: evidence from the X-ray light curve
It is believed that η Carinae is actually a massive binary system, with the wind―wind interaction responsible for the strong X-ray emission. Although the overall shape of the X-ray light curve can be…
The orientation of the ? Carinae binary system
We examine a variety of observations that shed light on the orientation of the semimajor axis of the η Carinae massive binary system. Under several assumptions, we study the following observations:…
The Orientation of Eta Carinae and the Powering Mechanism of Intermediate-luminosity Optical Transients (ILOTS)
Contrary to recent claims, we argue that the orientation of the massive binary system Eta Carinae is such that the secondary star is closer to us at periastron passage, and it is on the far side…
A High-Velocity Transient Outflow in η Carinae
We analyze velocity profiles of the X-ray spectral lines emitted by the η Carinae (η Car) stellar binary at four epochs, just before the X-ray minimum (associated with periastron) and more than 2…
The extended interacting wind structure of Eta Carinae
The highly eccentric binary system, η Car, provides clues to the transition of massive stars from hydrogen-burning via the CNO cycle to a helium-burning evolutionary state. The fastmoving wind of η…
Using X-ray observations to explore the binary interaction in Eta Carinae
We study the usage of the X-ray light curve, column density towards the hard X-ray source, and emission measure (density square times volume), of the massive binary system η Carinae to determine the…
Prediction for the He iλ10830 Å absorption wing in the coming event of η Carinae
We propose an explanation for the puzzling appearance of a wide blue absorption wing in the He I λ 10830 A P Cygni profile of the massive binary star η Car several months before periastron passage.…
Chandra X-Ray Grating Spectrometry of η Carinae near X-Ray Minimum. I. Variability of the Sulfur and Silicon Emission Lines
We report on variations in important X-ray emission lines in a series of Chandra grating spectra of the supermassive colliding wind binary star η Car, including key phases around the X-ray…
Constraining the absolute orientation of η Carinae’s binary orbit: a 3D dynamical model for the broad [Fe iii] emission
We present a three-dimensional (3-D) dynamical model for the broad [Fe III] emission observed in Eta Carinae using the Hubble Space Telescope/Space Telescope Imaging Spectrograph (HST/STIS). This…
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References

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