The following document lists the file abstract/WSCHUTTE_MINWATER.abs
from catalogue VI/111.
A plain copy of the file
(without headers/trailers) may be downloaded.
We propose to make high quality observations of the 2.75 micron feature of interstellar hydrated silicates which has been recently discovered by ISO towards Cyg.OB2 #12. A number of sources suffering from extinction by the diffuse interstellar medium are selected. Together with guaranteed time data of dense clouds sources and of mass-loosing giant stars our program could reveal the importance of hydration for grains in various interstellar environments. This information could yield important clues on the origin and evolution of interstellar silicates, i.e., whether cold formation in the interstellar medium or hot formation in the outflow of stars dominate. Showing considerable variation in different materials, comparison of high quality spectra of the hydration band with laboratory analog materials could furthermore clarify the composition of interstellar minerals.