SIMBAD references

2002A&A...384..585K - Astronomy and Astrophysics, volume 384, 585-593 (2002/3-3)

Dust and the spectral energy distribution of the OH/IR star OH 127.8+0.0: Evidence for circumstellar metallic iron.


Abstract (from CDS):

We present a fit to the spectral energy distribution of OH 127.8+0.0, a typical asymptotic giant branch star with an optically thick circumstellar dust shell. The fit to the dust spectrum is achieved using non-spherical grains consisting of metallic iron, amorphous and crystalline silicates and water ice. Previous similar attempts have not resulted in a satisfactory fit to the observed spectral energy distributions, mainly because of an apparent lack of opacity in the 3-8µm region of the spectrum. Non-spherical metallic iron grains provide an identification for the missing source of opacity in the near-infrared. Using the derived dust composition, we have calculated spectra for a range of mass-loss rates in order to perform a consistency check by comparison with other evolved stars. The L-[12µm] colours of these models correctly predict the mass-loss rate of a sample of AGB stars, strengthening our conclusion that the metallic iron grains dominate the near-infrared flux. We discuss a formation mechanism for non-spherical metallic iron grains.

Abstract Copyright:

Journal keyword(s): stars: AGB and post-AGB - circumstellar matter - dust, extinction - radiative transfer - infrared: stars

CDS comments: in ref list FLUKS 1994A&AS.105.311 instead of A&A.105.311

Simbad objects: 10

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