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Detection of deuterium Balmer lines in the Orion Nebula

G. Hebrard·D. Pequignot·A. Vidal-Madjar·J. R. Walsh·R. Ferlet
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Abstract

The detection and first identification of the deuterium Balmer emission lines, D-alpha and D-beta, in the core of the Orion Nebula is reported. Observations were conducted at the 3.6m Canada-France-Hawaii Telescope, using the Echelle spectrograph Gecko. These lines are very narrow and have identical 11 km/s velocity shifts with respect to H-alpha and H-beta. They are probably excited by UV continuum fluorescence from the Lyman (DI) lines and arise from the interface between the HII region and the molecular cloud.

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G. Hebrard, D. Pequignot, A. Vidal-Madjar, J. R. Walsh, R. Ferlet. 2000-02-07. Detection of deuterium Balmer lines in the Orion Nebula. https://arxiv.org/abs/astro-ph/0002141

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