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}
}
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… 

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