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Letter to the Editor
Revealing deuterium Balmer lines in H II regions with VLT-UVES *
G. Hébrard 1,
D. Péquignot 2,
J.R. Walsh 3,
A. Vidal-Madjar 1 and
R. Ferlet 1
Received 15 August 2000 / Accepted 25 August 2000
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 and D in Orion (Hébrard et al. 2000) is confirmed and deuterium lines are now detected up to at least D. 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.
Key words: line: identification ISM: atoms, ions ISM: H ii regions ISM: individual objects: M42, M8, M16, M20, M17, DEM S 103
Send offprint requests to: Guillaume Hébrard
Online publication: December 15, 2000