On the influence of the companion star in Eta Carinae: 2D radiative transfer modeling of the ultraviolet and optical spectra

@article{Groh2012OnTI,
  title={On the influence of the companion star in Eta Carinae: 2D radiative transfer modeling of the ultraviolet and optical spectra},
  author={Jose H Groh and D. John Hillier and Thomas I. Madura and G. Weigelt Max Planck Institute for Radioastronomy and H Germany and University of Pittsburgh and Usa},
  journal={arXiv: Solar and Stellar Astrophysics},
  year={2012}
}
We present 2D radiative transfer modeling of the Eta Carinae binary system accounting for the presence of a wind-wind collision (WWC) cavity carved in the optically-thick wind of the primary star. By comparing synthetic line profiles with HST/STIS spectra obtained near apastron, we show that the WWC cavity has a strong influence on multi-wavelength diagnostics. This influence is regulated by the modification of the optical depth in the continuum and spectral lines. We find that H-alpha, H-beta… Expand
A COMPANION AS THE CAUSE OF LATITUDE-DEPENDENT EFFECTS IN THE WIND OF ETA CARINAE*
We analyze spatially resolved spectroscopic observations of the Eta Carinae binary system obtained with the Hubble Space Telescope/STIS. Eta Car is enshrouded by the dusty Homunculus nebula, whichExpand
THE OPTICAL WIND LINE VARIABILITY OF η CARINAE DURING THE 2009.0 EVENT
We report on high-resolution spectroscopy of the 2009.0 spectroscopic event of η Carinae collected via SMARTS observations using the CTIO 1.5 m telescope and echelle spectrograph. Our observationsExpand
Origin of the Central Constant Emission Component of Eta Carinae
The campaign observations of the evolved super massive binary system, η Car, revealed an apparently non-variable X-ray emission component, which was observable only around periastron when theExpand
3D radiative transfer simulations of Eta Carinae's inner colliding winds – I. Ionization structure of helium at apastron
The highly eccentric binary system Eta Carinae (Eta Car) shows numerous time-variable emission and absorption features. These observational signatures are the result of interactions between theExpand
The environment of the wind–wind collision region of η Carinae
Context. η Carinae is a colliding wind binary hosting two of the most massive stars and featuring the strongest wind collision mechanical luminosity. The wind collision region of this system isExpand
3D time-dependent hydrodynamical and radiative transfer modeling of Eta Carinae’s innermost fossil colliding wind structures
Abstract Eta Carinae is the most massive active binary within 10,000 light-years. While famous for the largest non-terminal stellar explosion ever recorded, observations reveal a supermassive (∼120Expand
Modelling the Central Constant Emission X-ray component of η Carinae
The X-ray emission of $\eta$ Carinae shows multiple features at various spatial and temporal scales. The central constant emission (CCE) component is centred on the binary and arises from spatialExpand
GRAVITY chromatic imaging of η Car’s core - Milliarcsecond resolution imaging of the wind-wind collision zone (Brγ, He I)
Context. η Car is one of the most intriguing luminous blue variables in the Galaxy. Observations and models of the X-ray, ultraviolet, optical, and infrared emission suggest a central binary in aExpand
η Carinae: Particle acceleration and multimessenger aspects
$\eta$ Carinae is composed of two very massive stars orbiting each other in 5.5 years. The primary star features the densest known stellar wind, colliding with that expelled by its companion. TheExpand
Uncovering the orbital dynamics of stars hidden inside their powerful winds: application to η Carinae and RMC 140
Determining accurate orbits of binary stars with powerful winds is challenging. The dense outflows increase the effective photospheric radius, precluding direct observation of the Keplerian motion;Expand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 82 REFERENCES
He II λ4686 in η Carinae: Collapse of the wind-wind collision region during periastron passage
The periodic spectroscopic events in ? Carinae are now well established and occur near the periastron passage of two massive stars in a very eccentric orbit. Several mechanisms have been proposed toExpand
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
3D modelling of the colliding winds in η Carinae – evidence for radiative inhibition
The X-ray emission from the super-massive star η Car is simulated using a three dimensional model of the wind-wind collision. In the model the intrinsic X-ray emission is spatially extended andExpand
The qWR star HD 45166. II. Fundamental stellar parameters and evidence of a latitude-dependent wind
Context. The enigmatic object HD 45166 is a qWR star in a binary system with an orbital period of 1.596 day, and presents a rich emission-line spectrum in addition to absorption lines from theExpand
IS ETA CARINAE A FAST ROTATOR, AND HOW MUCH DOES THE COMPANION INFLUENCE THE INNER WIND STRUCTURE?*
We analyze interferometric measurements of the luminous blue variable Eta Carinae with the goal of constraining the rotational velocity of the primary star and probing the influence of the companion.Expand
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 ηExpand
Spectroscopic Effects of Rotation in Extended Stellar Atmospheres
Rotation can markedly impact the interpretation of spectral diagnostics from hot stars with winds. Using a newly developed formal solution code, and a semianalytic model for the effects of rotationExpand
The Ultraviolet Spectrum of η Carinae: Investigation of the Ejecta Absorption
We have investigated the far- through mid-UV (1150-2360 A) spectrum of η Carinae during the late stages of its broad maximum using the Hubble Space Telescope (HST) Space Telescope ImagingExpand
In hot pursuit of the hidden companion of Carinae: An X-ray determination of the wind parameters
We present X-ray spectral ts to a recently obtained Chandra grating spectrum of Carinae, one of the most massive and powerful stars in the Galaxy and which is strongly suspected to be a collidingExpand
The UV Scattering Halo of the Central Source Associated with η Carinae
We have made an extensive study of the UV spectrum ofCarinae and find that we do not directly observe the star and its wind in the UV. Because of dust along our line of sight, the UV light that weExpand
...
1
2
3
4
5
...