The predicted 1s 2-1s6p H− auto-ionization resonance observed as a diffuse interstellar line at 7581 Å |
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| Authors: | P. Gammelgaard M. Rudkjøbing |
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| Affiliation: | (1) Astronomical Institute, University of Aarhus, Denmark |
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| Abstract: | The 1s2-1s6p H– auto-ionization resonance has been observed as a diffuse interstellar line in several highly reddened O and B stars. The identification based on its wavelength has been confirmed by its equivalent width in HD 183143. The addition of the 1s2-1snp diffuse-line series raises the total H– oscillator strength of absorption to a value close to 2. |
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