EDP Sciences
Free Access
Volume 410, Number 1, October IV 2003
Page(s) 175 - 188
Section Formation, structure and evolution of stars
DOI https://doi.org/10.1051/0004-6361:20031151

A&A 410, 175-188 (2003)
DOI: 10.1051/0004-6361:20031151

Far UV spectroscopy of the circumstellar environment of the Herbig Be stars HD 259431 and HD 250550

J.-C. Bouret1, C. Martin1, M. Deleuil1, 2, T. Simon3 and C. Catala4

1  Laboratoire d'Astrophysique de Marseille, Traverse du Siphon, BP 8, 13376 Marseille Cedex 12, France
    e-mail: Claire.Martin@oamp.fr
2  Université de Provence, Centre de Mathématiques et d'Informatique, 39 rue J. Curie, 13453 Marseille Cedex 13, France
    e-mail: Magali.Deleuil@oamp.fr
3  Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA
    e-mail: simon@ifa.hawaii.edu
4  Observatoire de Paris-Meudon, CNRS, Paris, France
    e-mail: Claude.Catala@obspm.fr

(Received 9 May 2003 / Accepted 18 July 2003 )

We present an analysis of FUSE spectra of HD 259431 and HD 250550, two young Herbig Be stars. Numerous absorption lines of H 2 are seen in the spectrum of each star, revealing large amounts of this gas on the lines of sight. In addition, absorption lines from atomic species in different ionization and excitation states are also identified. We demonstrate that all these species probe the close circumstellar environment around the stars, with two or even three temperature components in HD 259431, as revealed by molecular gas analysis. Although favouring the flared disk scenario, our results do not rule out the possibility that we actually detect CS envelopes/halos around these stars.

Key words: stars: circumstellar matter -- stars: pre-main sequence -- stars: emission-lines, Be -- stars: individual: HD 259431, HD 250550

Offprint request: J.-C. Bouret, Jean-Claude.Bouret@oamp.fr

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