Detection of deuterium Balmer lines in the Orion Nebula

Details Detection of deuterium Balmer lines in the Orion Nebula Detection of deuterium Balmer lines in the Orion Nebula

2000-02-07

arxiv.org/abs/astro-ph/0002141v1

Astronomy and Astrophysics

Astrophysics

4 pages, latex, 1 figure, 1 table, accepted for publication in Astronomy & Astrophysics, Letters

Scientific paper

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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