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The composition and nature of the dust shell surrounding the binary AFGL 4106 by Molster, F. J.; Waters, L. B. F. M.; Trams, N. R.; van Winckel, H.; Decin, L.; van Loon, J. Th.; Jager, C.; Henning, Th.; Kaufl, H. -U.; de Koter, A.; Bouwman, J. is a scholarly article available to read on EtoBox.

What is The composition and nature of the dust shell surrounding the binary AFGL 4106 about?

We present infrared spectroscopy and imaging of AFGL~4106. The 2.4-5 micron ISO-SWS spectrum reveals the presence of a cool, luminous star (T_eff ~ 3750 K) in addition to an almost equally luminous F star (T_eff ~ 7250 K). The 5-195 micron SWS and LWS spectra are dominated by strong emission from circumstellar dust. We find that the dust consists of amorphous silicates, with a minor but significant contribution from crystalline silicates. The amorphous silicates consist of Fe-rich olivines. The presence of amorphous pyroxenes cannot be excluded but if present they contain much less Fe than the amorphous olivines. Comparison with laboratory data shows that the pure Mg-end members of the crystalline olivine and pyroxene solid solution series are present. In addition, we find strong evidence for simple oxides (FeO and Al2O3) as well as crystalline H2O ice. Several narrow emission features remain unidentified. Modelling of the dust emission using a dust radiation transfer code shows that large grains (~1 micron) must be present and that the abundance of the crystalline silicates is between 7 and 15% of the total dust mass, depending on the assumed enstatite to forsterite ratio, which i

Author

Molster, F. J.; Waters, L. B. F. M.; Trams, N. R.; van Winckel, H.; Decin, L.; van Loon, J. Th.; Jager, C.; Henning, Th.; Kaufl, H. -U.; de Koter, A.; Bouwman, J.

Published

1999

Language

EN