FUSE observations of H2 around the Herbig AeBe stars HD 100546 and HD 163296

A. Lecavelier des Etangs; A. Roberge; A. Vidal-Madjar; F. Le Petit; G. Hebrard; J.-C. Bouret; J.-M. Desert; M. Deleuil; P.D. Feldman

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FUSE observations of H2 around the Herbig AeBe stars HD 100546 and HD 163296

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arxiv astro-ph/0306449 v1 pith:4G2JUFTW submitted 2003-06-23 astro-ph

A. Lecavelier des Etangs , M. Deleuil , A. Vidal-Madjar , A. Roberge , F. Le Petit , G. Hebrard , P.D. Feldman , J.-M. Desert

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J.-C. Bouret

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keywords absorptionaebecircumstellarfuseherbiglayerobservationsstars

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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 H2. The thermalization of the rotational levels up to J~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.

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