A full description of the 5.5-yr low excitation events in η Carinae is presented. We show that
they are not as simple and brief as previously thought, but a combination of two components …

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 …

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 …

Abstract Spectra (1951–78) of the central object in η Car, taken by AD Thackeray, reveal
three previously unrecorded epochs of low excitation. Since 1948, at least, these states have …

Damineli et al.(1997)[NewA, 2, 107] have recently proposed a specific binary model for η
Carinae. It is based on wavelength shifts in hydrogen and helium emission lines, and may …

Context. The periodicity of 5.5 years for some observational events occurring in η Carinae
manifests itself across a large wavelength range and has been associated with its binary …

ABSTRACT I have discovered spectroscopic variations correlated with the photometric near-
infrared (NIR) light curve in &eegr; Carinae. The fading of the high-excitation lines is …

The periodic events occurring in η Carinæ have been widely monitored during the last three
5.5-year cycles. The last one recently occurred in January 2009 and more exhaustive …

ABSTRACT The interacting binary Eta Carinae remains one of the most enigmatic massive
stars in our Galaxy despite over four centuries of observations. In this work, its light curve …

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 …