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Astron. Astrophys. 338, L5-L8 (1998)

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Letter to the Editor

ORFEUS II echelle spectra: Absorption by H2 in the LMC *

K.S. de Boer 1, P. Richter 1, D.J. Bomans ** 2, A. Heithausen 3 and J. Koornneef 4

1 Sternwarte, Universität Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany
2 Astronomy Department, University of Illinois at Urbana-Champaign, 1002 West Green St., Urbana, IL 61801, USA
3 Radioastronomisches Institut, Universität Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany
4 Kapteyn Institute, Postbus 800, 9700 AV Groningen, The Netherlands

Received 2 July 1998 / Accepted 9 August 1998

Abstract

We report the first detection of H2 absorption profiles of LMC gas on the line of sight to star 3120 in the association LH 10 near the emission nebula N 11B. Transitions found in the Lyman band are used to derive a total column density [FORMULA]H[FORMULA] cm-2. Excitation temperatures of [FORMULA] K for levels [FORMULA] and of [FORMULA] K for levels [FORMULA] of H2 are derived. We conclude that moderate UV pumping influences the population even of the lowest rotational states in this LMC gas.

Key words: space vehicles – ISM: molecules – galaxies: ISM – Magellanic Clouds: LMC – stars: individual: LH 10:3120 – ultraviolet: ISM

* Data obtained under the DARA guest observing program in the ORFEUS II Mission
** now at: Astronomisches Institut, Ruhr-Universität Bochum, Postfach 102148, D-44780 Bochum, Germany

Send offprint requests to: deboer@astro.uni-bonn.de

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© European Southern Observatory (ESO) 1998

Online publication: September 8, 1998
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