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The Early Spectra of Eta Carinae 1892 to 1941 and the Onset of Its High Excitation Emission Spectrum
Roberta M. Humphreys, Kris Davidson, Michael Koppleman
The observed behavior of eta Car from 1860 to 1940 has not been considered in most recent accounts, nor has it been explained in any quantitative model. We have used modern digital…
X-ray Spectral Variation of Eta Carinae through the 2003 X-ray Minimum
Kenji Hamaguchi, Michael F. Corcoran, Theodore Gull +7
We report the results of an X-ray observing campaign on the massive, evolved star Eta Carinae, concentrating on the 2003 X-ray minimum as seen by the XMM-Newton observatory. These…
The Chrysalis Opens? Photometry from the Eta Carinae HST Treasury Project, 2002-2006
J. C. Martin, Kris Davidson, M. D. Koppelman
During the past decade Eta Car has brightened markedly, possibly indicating a change of state. Here we summarize photometry gathered by the Hubble Space Telescope as part of the HS…
Spitzer Space Telescope Infrared Imaging and Spectroscopy of the Crab Nebula
Tea Temim, Robert D. Gehrz, Charles E. Woodward +7
We present 3.6, 4.5, 5.8, 8.0, 24, and 70 micron images of the Crab Nebula obtained with the Spitzer Space Telescope IRAC and MIPS cameras, Low- and High-resolution Spitzer IRS spe…
Variable Unidentified Emission Near 6307 AA in Eta Carinae
J. C. Martin, K. Davidson, F. Hamann +2
We have discovered a conspicuous unidentified variable feature near 6307 AA in the spectrum of Eta Carinae which is spatially unresolved from the central star and its wind (r < 200…
Physical conditions in the Homunculus
Gary J. Ferland, Nick Abel, Kris Davidson +1
Conditions within the Homunculus nebula around Eta Car are determined by many of the same physical processes that occur in molecular clouds in the interstellar medium. But there is…