EDP Sciences
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Volume 407, Number 3, September I 2003
Page(s) 935 - 939
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20030924

A&A 407, 935-939 (2003)
DOI: 10.1051/0004-6361:20030924

FUSE observations of H $\mathsf{_2}$ around the Herbig AeBe stars HD 100546 and HD 163296

A. Lecavelier des Etangs1, M. Deleuil2, A. Vidal-Madjar1, A. Roberge3, 4, F. Le Petit5, G. Hébrard1, R. Ferlet1, P. D. Feldman3, J.-M. Désert1 and J.-C. Bouret2

1  Institut d'Astrophysique de Paris, CNRS, 98 bis Bld. Arago, Paris, France
2  Laboratoire d'Astrophysique de Marseille, Marseille, France
3  Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD, USA
4  Current Address: Carnegie Institution of Washington, Washington, DC, USA
5  Meudon Observatory, Meudon, France

(Received 5 March 2003 / Accepted 12 June 2003 )

We present the analysis of FUSE observations of two Herbig AeBe stars known to harbor young circumstellar disks: HD 100546 and HD 163296. In both cases we detect absorption lines from warm and dense H 2. The thermalization of the rotational levels up to $J\sim 4$ allows evaluation of the temperature, density and typical size of the absorbing layer. These quantities are consistent with absorption of the light of the central star by a thin layer of a circumstellar disk seen at an intermediate inclination.

Key words: planetary systems: protoplanetary disks -- circumstellar matter -- stars: individual: HD 100546 -- stars: individual: HD 163296 -- stars: pre-main sequence

Offprint request: A. Lecavelier des Etangs, lecaveli@iap.fr

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