A multispectral view of the periodic events in η Carinae
A multispectral view of the periodic events in η Carinae
A full description of the 5.5-yr low excitation events in Eta Carinae is presented. We show that they are not as simple and brief as previously thought, but a combination of two components. The first, the 'slow variation' component, is revealed by slow changes in the ionization level of circumstellar …