SIMBAD references

2002ApJ...568L.131G - Astrophys. J., 568, L131-L134 (2002/April-1)

A 3.4 micron band in magnesium silicates: preparation of hydrocarbon-silicate condensates.


Abstract (from CDS):

We have obtained infrared spectra of amorphous forsterite, Mg2SiO4, prepared in the presence of gaseous methane and find that hydrocarbon groups such as CH2 and CH3 can be incorporated in the silicate lattice. These chemical groups have little effect on the 10 µm silicate SiO stretching band but introduce a 3.4 µm band similar, but not identical, to that seen in pure carbonaceous deposits including hydrogenated amorphous carbon. Absorption in this band is enhanced in the 2958 and 2873 cm–1 (3.38 and 3.48 µm) transitions of the CH3 asymmetric and symmetric stretching vibrations, respectively. Additional absorption features identified with Si(CH3)1,2,3 and Si(CH2)Si groups have also been observed, and a band corresponding to the Si-phenyl stretch has been detected. We discuss the possibility that hydrocarbon-silicate grains may be a component of interstellar matter, particularly in the winds from asymptotic giant branch stars with mixed carbon-silicate chemistry.

Abstract Copyright:

Journal keyword(s): Stars: Circumstellar Matter - ISM: Lines and Bands - ISM: Molecules

Simbad objects: 8

goto Full paper

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2002ApJ...568L.131G and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact