A Sea Change in Eta Carinae
Andrea Mehner, Kris Davidson, Roberta M. Humphreys, John C. Martin,, Kazunori Ishibashi, Gary J. Ferland, Nolan R. Walborn
TL;DR
The paper reports an unprecedented decrease in stellar wind emission features of Eta Carinae, suggesting a rapid reduction in wind density, which could significantly impact understanding of massive star evolution.
Contribution
It documents a major, recent change in Eta Carinae's stellar wind emissions, highlighting a potential new phase in its evolution.
Findings
Stellar wind emission features decreased by a factor of 2
This change is unprecedented in modern observations
Suggests a rapid decrease in wind density
Abstract
Major stellar-wind emission features in the spectrum of Eta Car have recently decreased by factors of order 2 relative to the continuum. This is unprecedented in the modern observational record. The simplest, but unproven, explanation is a rapid decrease in the wind density.
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