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Secular Changes in Eta Carinae's Wind 1998-2011
Andrea Mehner, Kris Davidson, Roberta M. Humphreys +4
Stellar wind-emission features in the spectrum of eta Carinae have decreased by factors of 1.5-3 relative to the continuum within the last 10 years. We investigate a large data set…
The Photometric and Spectral Evolution of the 2008 Luminous Optical Transient in NGC 300
Roberta M. Humphreys, Howard E. Bond, Alceste Z. Bonanos +4
The 2008 optical transient in NGC 300 is one of a growing class of intermediate-luminosity transients that brighten several orders of magnitude from a previously optically obscured…
Critical Differences and Clues in Eta Car's 2009 Event
Andrea Mehner, Kris Davidson, John C. Martin +3
We monitored Eta Carinae with HST WFPC2 and Gemini GMOS throughout the 2009 spectroscopic event, which was expected to differ from its predecessor in 2003 (Davidson et al. 2005). H…
N II 5668-5712, a New Class of Spectral Features in Eta Carinae
Andrea Mehner, Kris Davidson, Gary J. Ferland
We report on the N II 5668-5712 emission and absorption lines in the spectrum of Eta Carinae. Spectral lines of the stellar wind regions can be classified into four physically dist…
Penetrating the Homunculus -- Near-Infrared Adaptive Optics Images of Eta Carinae
Étienne Artigau, John C. Martin, Roberta M. Humphreys +3
Near-infrared adaptive optics imaging with NICI and NaCO reveal what appears to be a three-winged or lobed pattern, the "butterfly nebula", outlined by bright Br and H emi…