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 …

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 …

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 …

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 …

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 …

Abstract Infrared (1.25–3.5 μm) light curves of η Carinae covering the last 20 yr are
presented and discussed. Three features are clearly seen in these data. First there is an …

In late 2006, ground-based photometry of η Car plus the Homunculus showed an
unexpected decrease in its integrated apparent brightness, an apparent reversal of its long …

We have measured the brightness variations in η Carinae for the past 6 years using the
Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph and Advanced …

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 …

JHKL photometry shows a slow brightening of η Car between 1972 and 1980 with a more
rapid increase in 1980/81. The total range is about 0.4 mag at K. The visual brightness also …