Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-08-04
Astronomy and Astrophysics
Astrophysics
4 pages, 3 figures, to appear in: "The Nature and Evolution of Disks around Hot Stars", eds.: R. Ignace & K. Gayley, Fig. 3 co
Scientific paper
B[e] supergiants are known to possess outflowing cool disks but also some unclassified B[e] stars show clear indications for the presence of a neutral disk. We derive constraints on the disk mass loss rates, temperature distributions and disk opening angles for the Small Magellanic Cloud B[e] supergiant Hen S 18 and the unclassified galactic B[e] star Hen 2-90 by modeling the line luminosities of the [OI] lines arising in their optical spectrum. These lines are supposed to form in a hydrogen neutral disk. We find disk mass fluxes of order 3.4 10^-4 g s^-1 cm^-2 and 5.5 10^{-1} g s^{-1}cm^{-2} resulting in disk mass loss rates of 1.0 10^{-4} M_sun yr^{-1} and 1.5 10^{-5} M_sun yr^{-1} for Hen S 18 and Hen 2-90, respectively.
Fernandes Marcelo Borges
Kraus Michaela
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