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On the huge mass loss of B[e] supergiants in the Magellanic Clouds

Published online by Cambridge University Press:  01 July 2008

M. Kraus ,
M. Borges Fernandes  and
F. X. de Araújo
M. Kraus
Affiliation:
Astronomický ústav, Akademie věd České republiky, Fričova 298, 251 65 Ondřejov, Czech Republic email: kraus@sunstel.asu.cas.cz
M. Borges Fernandes
Affiliation:
UMR 6525 H. Fizeau, Univ. Nice Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, Av. Copernic, 06130 Grasse, France email: Marcelo.Borges@obs-azur.fr
F. X. de Araújo
Affiliation:
Observatório Nacional, Rua General José Cristino 77, 20921-400 São Cristovão, Rio de Janeiro, Brazil email: araujo@on.br
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Abstract

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B[e] supergiants are known to possess circumstellar disks in which molecules and dust can form. The formation mechanism and the resulting structure of these disks is, however, still controversial. Nevertheless, to protect the disk material from the dissociating stellar radiation and to allow for dust formation in the vicinity of a luminous supergiant star, the amount of mass comprised within these disks must be huge. We study the amount of hydrogen neutral material by means of an analysis of the strong [O i] emission lines in our optical high-resolution FEROS spectra of two B[e] supergiants, the edge-on system S 65 in the SMC, and the pole-on system R 126 in the LMC. In addition, we study the possible disk dynamics of S 65, based on a simultaneous line-profile modeling. We find that the [O i] emission lines in S 65 must originate either from an outflowing disk, in which the outflow velocity is slowly decreasing outwards, or from a Keplerian rotating ring, resulting from an ejection event.

Keywords

circumstellar matterstars: individual (R 126, S 65)stars: mass losssupergiantsstars: windsoutflowsMagellanic Clouds
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S256: The Magellanic System: Stars, Gas, and Galaxies , July 2008 , pp. 431 - 436
Copyright
Copyright © International Astronomical Union 2009

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