He II λ4686 in η Carinae: Collapse of the wind-wind collision region during periastron passage
Teodoro, M; Damineli, Augusto; Arias, J I; De Araujo, F X; Barba, R H; Corcoran, M F; Borges Fernandes, M; Fernandez-Lajus, E; Fraga, L; McGregor, Peter; Nicholls , David; Gamen, R C; Parkin, Elliott; Groh, J H; Torres, M A P
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,
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