The Deuterium Balmer Series

Details The Deuterium Balmer Series The Deuterium Balmer Series

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..811h&link_type=abstract

Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July

Astronomy and Astrophysics

Astronomy

Scientific paper

The first detection and identification of deuterium Balmer lines were recently reported in HII regions of the Galaxy and the Small Magellanic Cloud using high spectral resolution data secured at CFHT and VLT. The DI lines appear as faint narrow emission features in the blue wings of the HI Balmer lines and can be distinguished from high-velocity HI emission. The identification with deuterium and the excitation mechanism by fluorescence are both established beyond doubt. Deuterium Balmer series might lead to a new optical method of deuterium abundance measurement in the interstellar medium. The lines may also allow stringent upper limits to be put on D/H in planetary nebulae. Finally deuterium Balmer lines may be the only way to observe deuterium in objects like the Magellanic Clouds or low metallicity blue compact galaxies.

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