Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...349..267d&link_type=abstract
Astronomy and Astrophysics, v.349, p.267-275 (1999)
Astronomy and Astrophysics
Astrophysics
49
Infrared: Ism: Lines And Bands, Molecular Processes, Ism: Abundances, Ism: Dust, Extinction, Ism: Molecules, Ism: Individual Objects: Rafgl7009S, Ism: Individual Objects: Iras 19110+1045
Scientific paper
We have studied the chemical composition of the silicates around the two massive protostellar objects RAFGL7009S (IRAS 18316-0602) and IRAS 19110+1045. The silicate features of both sources are similar. The position and shape of the 9.6 and 18 mu m silicate bands coincide with those of amorphous pyroxene-type silicates. We find that the silicate features cannot be reproduced with compact pyroxene grains containing magnesium and iron. An admixture of iron, aluminium and some degree of porosity is necessary to reproduce respectively the red wing of the 18 mu m band, the plateau between the two silicate bands and the widths of the bands. The iron is to be found in the form of Fe-rich pyroxenes, also containing small amounts of calcium, and in iron-oxides. Better fits are obtained with aluminium incorporated into the silicate structure (in aluminosilicates) than for aluminium in oxides such as Al_2O_3. The compositions we propose are in agreement with cosmic elemental abundance constraints. No crystalline material is observed in either source and we find that at most 1-2% of the silicate mass could be crystalline in these sources. Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, the Netherlands and the United Kingdom) and with the participation of ISAS and NASA.
Cox Pierre
d'Hendecourt Louis
Dartois Emmanuel
Demyk Karine
Jones Adrian P.
No associations
LandOfFree
The chemical composition of the silicate dust around RAFGL7009S and IRAS 19110+1045 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The chemical composition of the silicate dust around RAFGL7009S and IRAS 19110+1045, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The chemical composition of the silicate dust around RAFGL7009S and IRAS 19110+1045 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1766040