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Damineli A, Kaufer A, Wolf B, et al. eta Carinae: Binarity Confirmed. Astrophys J. 2000;528(2):L101-L104doi: 10.1086/312441.
Damineli, A., Kaufer, A., Wolf, B., Stahl, O., Lopes, D. F., & de Araújo FX. (2000). eta Carinae: Binarity Confirmed. The Astrophysical journal, 528(2), L101-L104. https://doi.org/10.1086/312441
Damineli, et al. "eta Carinae: Binarity Confirmed." The Astrophysical journal vol. 528,2 (2000): L101-L104. doi: https://doi.org/10.1086/312441
Damineli A, Kaufer A, Wolf B, Stahl O, Lopes DF, de Araújo FX. eta Carinae: Binarity Confirmed. Astrophys J. 2000 Jan 10;528(2):L101-L104. doi: 10.1086/312441. PMID: 10600628.
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Astrophys J. 2000 Jan 10;528(2):L101-L104. doi: 10.1086/312441.

eta Carinae: Binarity Confirmed.

The Astrophysical journal

Damineli, Kaufer, Wolf, Stahl, Lopes, de Araújo FX

PMID: 10600628 DOI: 10.1086/312441

Abstract

We report the recovery of a spectroscopic event in eta Carinae in 1997/1998 after a prediction by Damineli in 1996. A true periodicity with P=2020+/-5 days (0.2% uncertainty) is obtained. The line intensities and the radial velocity curve display a phase-locked behavior, implying that the energy and dynamics of the event repeat from cycle to cycle. This rules out S Doradus oscillation or multiple shell ejection by an unstable star as the explanation of the spectroscopic events. A colliding-wind binary scenario is supported by our spectroscopic data and by X-ray observations. Although deviations from a simple case exist around periastron, intensive monitoring during the next event (mid-2003) will be crucial to our understanding of the system.

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