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Absorption at 11 µm in the interstellar medium and embedded sources: evidence for crystalline silicates
Wright, Christopher M.; Do Duy, Tho; Lawson, Warrick
An absorption feature is occasionally reported around 11 µm in astronomical spectra, including those of forming stars. Candidate carriers include water ice, polycyclic aromatic hydrocarbons, silicon carbide, crystalline silicates or even carbonates. All are known constituents of cosmic dust in one or more types of environments, though not ne…
A new approach to the infrared photometric study of Be stars
Chen, P. S.; Liu, J. Y.; Shan, H. G.
In this paper, we have collected data for almost all Be stars known so far (1991 sources in total) and photometrically study their infrared properties. 2MASS, WISE, IRAS and Akari data are analysed. It is shown from several two-colour diagrams that from 1 to 60 µm, infrared excesses for the majority of Be stars are mainly due to the free-fre…