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Astron. Astrophys. 335, 1025-1028 (1998)


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Zeeman splitting in interstellar molecules

II. The ethynyl radical

N. Bel * 1 and B. Leroy 2

1 Observatoire de Paris, DAEC, URA 173 du CNRS, Université Paris 7, F-92195 Meudon Cedex, France
2 Observatoire de Paris, DASOP, URA 2080 du CNRS, F-92195 Meudon Cedex, France

Received 3 March 1998 / Accepted 24 April 1998

Abstract

The Zeeman splitting that a longitudinal magnetic field would produce on the ethynyl radical is calculated for the transitions typical of those observed in the interstellar clouds. It turns out that the ubiquitous CCH radical adds to the list of the few interstellar molecules that could be used to determine magnetic fields in molecular clouds.

Key words: ISM: clouds – ISM: magnetic fields – ISM: molecules – radio lines: ISM

* Deceased July 29, 1995

Send offprint requests to: B. Leroy
Correspondence to: Bernard.Leroy@obspm.fr

© European Southern Observatory (ESO) 1998

Online publication: June 26, 1998

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