N II 5668-5712, a New Class of Spectral Features in Eta Carinae

Details N II 5668-5712, a New Class of Spectral Features in Eta Carinae N II 5668-5712, a New Class of Spectral Features in Eta Carinae

2011-04-11

arxiv.org/abs/1104.1829v2

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

4 figures, 1 table

Scientific paper

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 distinct categories: 1) low-excitation emission such as H I and Fe II, 2) higher excitation He I features, 3) the N II lines discussed in this paper, and 4) He II emission. These categories have different combinations of radial velocity behavior, excitation processes, and dependences on the secondary star. The N II lines are the only known features that originate in "normal" undisturbed zones of the primary wind but depend primarily on the location of the hot secondary star. N II probably excludes some proposed models, such as those where He I lines originate in the secondary star's wind or in an accretion disk.

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