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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 198331.0, MPI für Astronomie / Publikationen_mpia
New laboratory spectra of isolated b-SiC
nanoparticles: Comparison with spectra taken by
the Infrared Space Observatory
Authors:Clément, D.; Mutschke, H.; Klein, R.; Henning, Th.
Date of Publication (YYYY-MM-DD):2003
Title of Journal:The Astrophysical Journal
Journal Abbrev.:The Astrophysical Journal
Volume:594
Start Page:642
End Page:650
Review Status:not specified
Audience:Experts Only
Abstract / Description:We present new laboratory infrared spectra of
matrix-isolated **beta;-SiC nanoparticles, which
perfectly match the band profile of the 11+ µm
feature observed in carbon stars. The new
laboratory spectra differ in the shape of the
band profile from former measurements of SiC
nanoparticles thanks to the matrix-isolation
technique which allows to obtain spectra of
nonagglomerated particles. The final spectra are
corrected for the influence of the surrounding
medium (argon-matrix) by a computational
technique proposed by Papoular et al. (1998).
Furthermore, we study the influence of nitrogen
incorporation into the SiC lattice, which
introduces a strong near-infrared absorption
owing to surface-plasmon excitation (Mutschke et
al. 1999). Our laboratory spectra are compared
with Infrared Space Observatory observations of
several carbon stars showing an 11 µm feature
either in emission or in absorption. We discuss
the implications of the new laboratory results
for the interpretation of the spectra of carbon
stars. 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 UK) and with
the participation of ISAS and NASA. The SWS is a
joint project of SRON and MPE.
Free Keywords:Astrochemistry; Stars: Circumstellar Matter;
; Infrared: Stars; Methods: Laboratory; Stars: AGB
; and Post-AGB; Stars: Carbon
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
External Affiliations:Universitäts-Sternwarte, Schillergäßchen 3,
D-07745 Jena, Germany), AB(Astrophysikalisches
Institut und Universitäts-Sternwarte,
Schillergäßchen 3, D-07745 Jena, Germany),
AC(Astrophysikalisches Institut und
Universitäts-Sternwarte, Schillergäßchen 3,
D-07745 Jena, Germany), AD(Max-Planck-Institut
für Astronomie (MPIA), Königstuhl 17, D-69117
Heidelberg, Germany)
Identifiers:URL:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi... [ID No:1]
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