Eta Carinae's 2014.6 Spectroscopic Event: The Extraordinary He II and N II Features

Abstract

Eta Carinae's spectroscopic events (periastron passages) in 2003, 2009, and 2014 differed progressively. He II 4687 and nearby N II multiplet 5 have special significance because they respond to very soft X-rays and the ionizing UV radiation field (EUV). HST/STIS observations in 2014 show dramatic increases in both features compared to the previous 2009.1 event. These results appear very consistent with a progressive decline in the primary wind density, proposed years ago on other grounds. If material falls onto the companion star near periastron, the accretion rate may now have become too low to suppress the EUV

arXiv commentTo appear in the Astrophysical Journal Letters

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• $\eta$ Carinae: high angular resolution continuum, H30$\alpha$ and He30$\alpha$ ALMA images
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• The orientation of Eta Carinae and the powering mechanism of intermediate luminosity optical transients (ILOTs)