Explaining the He II Emission in Eta Carinae

Details Explaining the He II Emission in Eta Carinae Explaining the He II Emission in Eta Carinae

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...206.0808d&link_type=abstract

American Astronomical Society Meeting 206, #08.08; Bulletin of the American Astronomical Society, Vol. 37, p.441

Astronomy and Astrophysics

Astronomy

Scientific paper

We report Hubble Space Telescope (HST) observations of emission in Eta Carinae near 4680 Å, presumably He II λ 4687, which is not spatially resolved from the central star. The emission was not detected in the spectrum from 1998.0 to 2003.0, or after the spectroscopic event in 2003.5. It appeared in early 2003, rapidly grew to a larger brightness than the previous authors reported, and then disappeared suddenly near 2003.5. For several weeks the λ 4687 luminosity was too high to explain easily in most proposed models for Eta Car's spectroscopic events. According to our analyses, this feature appears most consistent with a wind-disturbance or mass-ejection type of model with relatively high gas densities. An unusual form of radiative excitation, making use of trapped He II λ 304 resonance photons, may have played a major role.

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