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Volumn 309, Issue 5735, 2005, Pages 737-741

Geochemistry: Supernova olivine from cometary dust

Author keywords

[No Author keywords available]

Indexed keywords

AGGREGATES; CONDENSATION; DUST; GRAIN SIZE AND SHAPE; MICROSTRUCTURE; PLANETARY SURFACE ANALYSIS; SILICATES;

EID: 23044472339     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.1109602     Document Type: Article
Times cited : (138)

References (68)
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    • note
    • Three of the four amorphous presolar silicate grains found thus far are categorized as GEMS grains (glass with embedded metal and sulfides), materials that comprise a major component of cometary/anhydrous IDPs, occasionally exceeding 50 weight % of the IDP. GEMS grains are typically 0.1 to 0.5 μm in size, have approximately chondritic elemental abundances (with the exception of C), and have optical properties consistent with those observed for interstellar amorphous silicates (58).
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    • Materials and methods are available as supporting material on Science Online.
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    • Delta values represent the deviation of the measured isotopic ratio from the value of the terrestrial standard, in parts per thousand (‰): δR = (R measured/R standard - 1) × 1000.
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    • 30Si value (100‰) is too great to permit a similar inference of its true isotopic composition.
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    • note
    • This is the inaugural paper from the newly established Robert M. Walker Laboratory for Space Science at Astromaterials Research and Exploration Science, NASA Johnson Space Center. This research was supported by NASA Cosmochemistry grants to S.M., L.P.K., and D.S.L. This work was enabled by the NanoSIMS ion microprobe designed by G. Slodzian. We thank A. Heger and S. Woosley for generously sharing unpublished supernova model data. The revision of this paper benefited from careful reviews by two anonymous reviewers.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.