Document Detail

Titanium carbide nanocrystals in circumstellar environments.
MedLine Citation:
PMID:  10764639     Owner:  NLM     Status:  MEDLINE    
Meteorites contain micrometer-sized graphite grains with embedded titanium carbide grains. Although isotopic analysis identifies asymptotic giant branch stars as the birth sites of these grains, there is no direct observational identification of these grains in astronomical sources. We report that infrared wavelength spectra of gas-phase titanium carbide nanocrystals derived in the laboratory show a prominent feature at a wavelength of 20.1 micrometers, which compares well to a similar feature in observed spectra of postasymptotic giant branch stars. It is concluded that titanium carbide forms during a short (approximately 100 years) phase of catastrophic mass loss (>0.001 solar masses per year) in dying, low-mass stars.
G von Helden; A G Tielens; D van Heijnsbergen; M A Duncan; S Hony; L B Waters; G Meijer
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  288     ISSN:  0036-8075     ISO Abbreviation:  Science     Publication Date:  2000 Apr 
Date Detail:
Created Date:  2000-04-20     Completed Date:  2000-04-20     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  313-6     Citation Subset:  IM; S    
FOM Institute for Plasma Physics Rijnhuizen, Edisonbaan 14, NL-3430 BE Nieuwegein, Netherlands.
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MeSH Terms
Astronomical Phenomena
Cosmic Dust*
Reg. No./Substance:
0/Cosmic Dust; 12070-08-5/titanium carbide; 7440-32-6/Titanium

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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