Revealing deuterium Balmer lines in HII regions with VLT-UVES

Details Revealing deuterium Balmer lines in HII regions with VLT-UVES Revealing deuterium Balmer lines in HII regions with VLT-UVES

2000-08-28

arxiv.org/abs/astro-ph/0008420v1

Astronomy and Astrophysics

Astrophysics

5 pages, latex, 7 figures, 2 tables, to be published in the special Dec.1 issue of Astronomy & Astrophysics Letters "Early Sci

Scientific paper

The search for deuterium Balmer lines with VLT-UVES is reported in HII regions of the Galaxy and the Magellanic Clouds. 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 previous identification to deuterium is re-inforced beyond doubt. The detection of D-alpha and D-beta in Orion (Hebrard et al. 2000) is confirmed and deuterium lines are now detected up to at least D-eta. The UVES observations provide the first detection of Balmer DI lines in four new HII regions (M 8, M 16, M 20, and DEM S 103 in SMC), demonstrating that these lines are of common occurence.

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