Grains of anomalous isotopic composition from novae
نویسندگان
چکیده
منابع مشابه
Presolar Grains from Novae
We report the discovery of five SiC grains and one graphite grain isolated from the Murchison carbonaceous meteorite whose major-element isotopic compositions indicate an origin in nova explosions. The grains are characterized by low C/C (4-9) and N/N (5-20) ratios, large excesses in Si (Si/Si ratios range to 2.1 times solar) and high Al/Al ratios. These isotopic signatures are theoretically pr...
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a Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya, EUETIB, E-08036 Barcelona, Spain b Institut d’Estudis Espacials de Catalunya (IEEC), E-08034 Barcelona, Spain c Physik Department E12, Technische Universität München, D-85748 Garching, Germany d Maier-Leibnitz-Laboratorium der Münchner Universitäten (MLL), D-85748 Garching, Germany e Department of Physics, Centr...
متن کاملOxygen-rich Stardust Grains from Novae
Stardust grains which have condensed from nova ejecta are exceedingly rare in meteorites. Principally through proton captures, novae are efficient producers of the stable isotopes 13 C, 15 N, and 17 O, as well as radioactive isotopes such as 22 Na and 26 Al. To date, primarily carbonaceous phases of stardust grains (e.g., SiC and graphite), have been purported to have a nova origin. Conversely,...
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We present new observations of the isotopic composition of low-energy He, C, N, 0, and Ne nuclei. The observations cover the energy interval from ,...., 5 to 30 MeV per nucleon, the energy range where the "anomalous cosmic ray" fluxes of He, N, 0, and Ne have been observed. We compare the isotopic composition of the anomalous cosmic rays with that of higher-energy galactic cosmic rays in an eff...
متن کاملIsotopic analysis of presolar graphite grains from Orgueil
We report the successful isolation and isotopic analysis of presolar graphite grains from the Orgueil CI chondrite. Isotopic measurements were made on seven density fractions, with grain sizes >1 lm: ORG1b (1.59–1.67 g cm ), 1c (1.67–1.75 g cm ), 1d (1.75– 1.92 g cm ), 1f (2.02–2.04 g cm ), 1g (2.04–2.12 g cm ), 1h (2.12–2.16 g cm ) and 1i (2.16–2.30 g cm ). We measured C, N, O, and Si isotopes...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1976
ISSN: 0004-637X,1538-4357
DOI: 10.1086/154101