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| Paper: |
He II λ4686 in η Carinae and Wind Collapse at Periastron |
| Volume: |
465, Four Decades of Massive Star Research - A Scientific Meeting in Honor of Anthony J. Moffat |
| Page: |
319 |
| Authors: |
Damineli, A.; Teodoro, M. |
| Abstract: |
We report high quality data for the 2009.0 spectroscopic event in η Carinae, in particular for the He II λ4686 line, taken at high dispersion with 6 telescopes. The intrinsic luminosity LHe II λ4686 = 270 L☉ just before periastron reveals the presence of a luminous transient UV source, produced by the shocked primary's wind. The pre-periastron peaks are correlated with those seen in X-rays and are produced by clumps in the primary's wind. After disappearing at phase φ = 0.004, the line rises again, when X-rays are still absent, reaching a maximum at φ = 0.02, which seems to be caused by a collapse of the wind-wind collision onto the “surface” of the secondary star. |
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