The Meteoritic Theory
نویسندگان
چکیده
منابع مشابه
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New abundance tables have been compiled for Cl chondrites and the solar photosphere and corona, based on a critical review of the literature to mid-1988. The meteorite data are generally accurate to +5-10%. Significant discrepancies between Sun and meteorites occur only for Fe, Mn, Ge, Pb, and W; other well-determined elements agree to &90/o on the average. There is no evidence for group fracti...
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Supernova Environment and Triggered Molecular Cloud Collapse: I have been studying the operation of the r-process in a core collapse supernova just after the large flux of neutrinos and antineutrinos has blown the presupernova envelope off the newly formed neutron star [1,2]. The hot (10 K) neutron star surface will emit a wind largely composed of neutrons, but these will only build up r-proces...
متن کاملThe SiC problem : astronomical and meteoritic evidence
Pre-solar grains of silicon carbide found in meteorites and interpreted as having had an origin around carbon stars from their isotopic composition, have all been found to be of the β-SiC polytype. Yet to date fits to the 11.3-µm SiC emission band of carbon stars had been obtained only for α-SiC grains. We present thin film infrared (IR) absorption spectra measured in a diamond anvil cell for b...
متن کاملThe Petrography of Meteoritic Nano-diamonds
Introduction: At least some meteoritic nano-diamonds are likely of presolar origin because of their association with anomalous Xe-HL and Te isotopic components indicative of a supernova (SN) origin [1,2]. But the abundance of Xe is such that only ~1 in 10 6 nano-diamonds contains a Xe atom, and the bulk 13 C/ 12 C composition of nano-diamond acid residues is chondritic (solar) [3]. Therefore, i...
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ژورنال
عنوان ژورنال: Nature
سال: 1889
ISSN: 0028-0836,1476-4687
DOI: 10.1038/040053b0