Sr II and [Sr II] emission in the ejecta of η Carinae

Torgil Zethson, Theodore R. Gull, Henrik Hartman, Sveneric Johansson, Kris Davidson, Kazunori Ishibashi

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We have discovered four extremely surprising emission lines of strontium in ejecta near η Carinae. Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph (STIS) observations made in 1999 show two narrow features whose wavelengths correspond to the forbidden transitions of Sr II, and we have found no other plausible identification for these lines. The identifications are confirmed by new HST/STIS observations of the same stellar position, in which the Sr II resonance lines are observed. Moreover, [Ti II], [Ni II], [Mn II], and [Co II] lines are unusually strong relative to [Fe II] at the same position.

Original languageEnglish (US)
Pages (from-to)322-326
Number of pages5
JournalAstronomical Journal
Issue number1
StatePublished - Jul 2001


  • Circumstellar matter
  • Stars: individual (η Carinae)
  • Stars: variables: other


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