Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 413, Issue 4, Pages 2658-2664Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2011.18340.x
Keywords
binaries: general; stars: individual: eta Car; stars: massive; stars: mass-loss; stars: winds, outflows; infrared: stars
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Funding
- Asher Fund for Space Research at the Technion
- Israel Science Foundation
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We use recent observations of the He i lambda 10 830 A absorption line and 3D hydrodynamical numerical simulations of the winds collision to strengthen the case for an orientation of the semimajor axis of the massive binary system eta Carinae where the secondary star is toward us at periastron passage. These observations show that the fast blue absorption component exists for only several weeks prior to the periastron passage. We show that the transient nature of the fast blue absorption component supports a geometry where the fast secondary wind, both pre- and post-shock material, passes in front of the primary star near periastron passage.
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