# He ii λ4686 IN η CARINAE: COLLAPSE OF THE WIND–WIND COLLISION REGION DURING PERIASTRON PASSAGE

@article{Teodoro2011HeI,
title={He ii $\lambda$4686 IN $\eta$ CARINAE: COLLAPSE OF THE WIND–WIND COLLISION REGION DURING PERIASTRON PASSAGE},
author={M. Teodoro and Augusto Damineli and Julia I. Arias and Francisco X. de Ara{\'u}jo and Rodolfo H. Barb'a and Michael F. Corcoran and M. Borges Fernandes and Eduardo Fern'andez-Laj'us and L Fraga and Roberto C Gamen and J. F. Gonz'alez and Jose H. Groh and Jennifer L. Marshall and Peter J. Mcgregor and Nidia I. Morrell and David C. Nicholls and Elliot Ross Parkin and Claudio Bastos Pereira and Mark M. Phillips and Gladys Rebeca Solivella and Jo{\~a}o Evangelista Steiner and Maximilian D. Stritzinger and Ian B. Thompson and Carlos A. O. Torres and Miguel Angel P{\'e}rez Torres and M. I. Zevallos Herencia},
journal={The Astrophysical Journal},
year={2011},
volume={746}
}
• Published 12 April 2011
• Physics
• The Astrophysical Journal
The periodic spectroscopic events in η 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 to explain the variations of different spectral features, such as an eclipse by the wind–wind collision (WWC) boundary, a shell ejection from the primary star or accretion of its wind onto the secondary. All of them have problems explaining all the observed phenomena. To better understand the nature of…
• Physics
• 2015
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 observations
• A. Kashi
• Physics
Proceedings of the International Astronomical Union
• 2018
Abstract Using high resolution 3D hydrodynamical simulations we quantify the amount of mass accreted onto the secondary star of the binary system η Carinae during periastron passage on its highly
• Physics
Monthly Notices of the Royal Astronomical Society
• 2020
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;
• Physics
• 2016
We have monitored the massive binary star $\eta$ Carinae with the CTIO/SMARTS 1.5~m telescope and CHIRON spectrograph from the previous apastron passage of the system through the recent 2014.6
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
• Physics
• 2014
X-ray emission from the supermassive binary system η Car declines sharply around periastron. This X-ray minimum has two distinct phases—the lowest flux phase in the first ∼3 weeks and a brighter
• Physics
• 2018
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. Kashi
• Physics
Monthly Notices of the Royal Astronomical Society
• 2019
We use high resolution 3D hydrodynamical simulations to quantify the amount of mass accreted onto the secondary star of the binary system Eta Carinae, exploring two sets of stellar masses that had
• Physics
• 2011
We monitored Eta Carinae with the Hubble Space Telescope WFPC2 and Gemini GMOS throughout the 2009 spectroscopic event, which was expected to differ from its predecessor in 2003. Here we report major

## References

SHOWING 1-10 OF 78 REFERENCES

• Physics
• 2006
We continue to explore the accretion model of the massive binary system η Car by studying the anomalously high He II λ4686 line. The line appears just before periastron and disappears immediately
• Physics
• 2006
We calculate the X-ray luminosity and light curve for the stellar binary system η Car for the entire orbital period of 5.54 yr. By using a new approach we find, as suggested in previous works, that
We examine the influence of the gravity of the companion (the secondary) to the massive primary star η Carinae on the winds blown by the primary and the secondary. The two winds collide with each
• Physics
• 2009
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
I propose a scenario to account for the fast polar outflow detected to be blown by η Carinae in 2000. The scenario also accounts for the lack of this flow in 1998 and 1999. The scenario is based on
We show that the rapid and large decrease in the intensity of high-ionization emission lines from the η Carinae massive binary system can be explained by the accretion model. These emission lines are
• Physics
• 2011
We report new Hubble Space Telescope/Space Telescope Imaging Spectrograph observations that map the high-ionization forbidden line emission in the inner arcsecond of Eta Car, the first that fully
• Physics
• 2009
We quantify the rapid variations in X-ray brightness (“flares”) from the extremely massive colliding wind binary η Carinae seen during the past three orbital cycles by the Rossi X-ray Timing
• Physics
• 2006
We describe and analyze Hubble Space Telescope (HST) observations of transient emission near 4680 Å in η Car, reported earlier by Steiner & Damineli. If, as seems probable, this is He II λ4687, then
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 colliding