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• W2171900948 abstract "We present infrared spectroscopy and imaging of AFGL 4106. The 2.4-5m ISO-SWS spectrum reveals the presence of a cool, luminous star (T eff 3750 K) in addi- tion to an almost equally luminous F star (T eff 7250 K). The 5-195 m SWS and LWS spectra are dominated by strong emis- sion 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 trans- fer code shows that large grains ( 1 m) 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 is estimated to be between 1 and 3. The amorphous and crystalline dust components in the shell do not have the same temperature, implying that the different dust species are not thermally coupled. We find a dust mass of 3:9 10 2 M expelled over a period of 4 10 3 years for a distance of 3.3 kpc. The F-star in the AFGL 4106 binary is likely a post-red-supergiant in transition to a blue supergiant or WR phase." @default.
• W2171900948 created "2016-06-24" @default.
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• W2171900948 date "1999-08-06" @default.
• W2171900948 modified "2023-09-27" @default.
• W2171900948 title "The composition and nature of the dust shell surrounding the binary AFGL 4106" @default.
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