# The periodicity of the η Carinae events

@article{Damineli2007ThePO,
title={The periodicity of the $\eta$ Carinae events},
author={Augusto Damineli and Michael F. Corcoran and D. John Hillier and Otmar Stahl and Ronaldo Savarino Levenhagen and Nelson Vani Leister and Jose H Groh and Mairan Macedo Teodoro and Juan Facundo Albacete Colombo and F. Gonz{\'a}lez and J I Arias and Hugo Levato and Massimiliano Grosso and Nidia I. Morrell and R C Gamen and George Wallerstein and V. Avila-Reese Instituto de Astronomia and Geof'isica e Ciencias Atmosf'ericas and Universidade de Sao Paulo and Brazil Department of Physics and Astronomy and University of Pittsburgh and Usa Cresst and X-ray Astrophysics Laboratory and NasaGsfc and Usa Universities Space Research Association and Usa Zah and Landessternwarte and Germany Facultad de Ciencias Astronomicas y Geofisicas de Leoncito and Argentina Departamento de F'isica and Universidad de La Serena and Chile Las Campanas Observatory and Carnegie Observatories and Chile Department of Astronomy and University of Washington and Usa In memoriam},
journal={Monthly Notices of the Royal Astronomical Society},
year={2007},
volume={384},
pages={1649-1656}
}
Extensive spectral observations of η Carinae over the last cycle, and particularly around the 2003.5 low-excitation event, have been obtained. The variability of both narrow and broad lines, when combined with data taken from two earlier cycles, reveal a common and well-defined period. We have combined the cycle lengths derived from the many lines in the optical spectrum with those from broad-band X-rays, optical and near-infrared observations, and obtained a period length of P pres = 2022.7… Expand
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#### References

SHOWING 1-10 OF 29 REFERENCES
The 5.52 Year Cycle of Eta Carinae: BeppoSAX Detection of Variable Hard (> 10 keV) X-Ray Emission
I have discovered spectroscopic variations correlated with the photometric near-infrared (NIR) light curve in η Carinae. The fading of the high-excitation lines is coincident with the peaks in theExpand
Variability of η Carinae – III
• Physics
• 2000
Spectra (1951–78) of the central object in η Car, taken by A. D. Thackeray, reveal three previously unrecorded epochs of low excitation. Since 1948, at least, these states have occurred regularly inExpand
Eta Carinae: a long period binary?
• Physics
• 1997
Abstract We present new observations of η Carinae, strongly suggesting that it is a binary system. High dispersion measurements of the broad Paγ emission line show periodic radial velocity variationsExpand
η Carinae across the 2003.5 Minimum: Spectroscopic Evidence for Massive Binary Interactions
We have analyzed high spatial, moderate spectral resolution observations of η Carinae (η Car) obtained with the STIS from 1998.0 to 2004.3. The data were obtained at discrete times covering an entireExpand
Long-term spectroscopy of η Carinae - I. The high and low excitation phases
• Physics
• 1998
Quantitative measurements of line parameters in the spectrum of η Carinae are presented for both the broad and narrow line components. A total of 655 spectral features were measured in the spectralExpand
Detection of He II 4686 in eta Carinae
• Physics
• 2004
We report the detection of the emission line He II 4686 A in eta Carinae. The equivalent width of this line is ~100 mA along most of the 5.5-yr cycle and jumps to ~900 mA just before phase 1.0,Expand
A Change in the Physical State of η Carinae
During η Car's spectroscopic event in mid-2003, the stellar wind's bright Hα and Hβ emission lines temporarily had a distinctive shape unlike that reported on any previous occasion and particularlyExpand
X-Ray Monitoring of η Carinae: Variations on a Theme
We present monitoring observations by the Rossi X-Ray Timing Explorer of the 2–10 keV X-ray emission from the supermassive star η Carinae from 1996 through late 2003. These data cover more than oneExpand
The 2003 shell event in η Carinae
• Physics
• 2004
Near-infrared, JHKL, photometry of η Car is reported covering the period 2000-2004. This includes the 2003 shell event which was the subject of an international multiwavelength campaign. The fadingExpand
eta Carinae: Binarity Confirmed.
• Damineli, Wolf
• Physics, Medicine
• The Astrophysical journal
• 2000
Although deviations from a simple case exist around periastron, intensive monitoring during the next event (mid-2003) will be crucial to the understanding of the system, implying that the energy and dynamics of the event repeat from cycle to cycle. Expand