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Titolo:
TYPE-X SILICON-CARBIDE PRESOLAR GRAINS - TYPE IA SUPERNOVA CONDENSATES
Autore:
CLAYTON DD; ARNETT D; KANE J; MEYER BS;
Indirizzi:
CLEMSON UNIV,DEPT PHYS & ASTRON CLEMSON SC 29634 UNIV ARIZONA,STEWARD OBSERV TUCSON AZ 85721 LAWRENCE LIVERMORE NATL LAB LIVERMORE CA 94550 CLEMSON UNIV,DEPT PHYS & ASTRON CLEMSON SC 29634
Titolo Testata:
The Astrophysical journal
fascicolo: 2, volume: 486, anno: 1997,
parte:, 1
pagine: 824 - 834
SICI:
0004-637X(1997)486:2<824:TSPG-T>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
MURCHISON METEORITE; ISOTOPIC COMPOSITIONS; WHITE-DWARFS; SIC GRAINS; GRAPHITE; ORIGIN; NUCLEOSYNTHESIS; EXPLOSIONS; NITROGEN; DENSITY;
Keywords:
DUST, EXTINCTION; ISM, ABUNDANCES; ISM, MOLECULES; NUCLEAR REACTIONS, NUCLEOSYNTHESIS, ABUNDANCES; SUPERNOVAE, GENERAL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
33
Recensione:
Indirizzi per estratti:
Citazione:
D.D. Clayton et al., "TYPE-X SILICON-CARBIDE PRESOLAR GRAINS - TYPE IA SUPERNOVA CONDENSATES", The Astrophysical journal, 486(2), 1997, pp. 824-834

Abstract

In terms of nucleosynthesis issues alone, we demonstrate that the type X silicon carbide particles have chemical and isotopic compositions resembling those from explosive helium burning in N-14-rich matter. These particles are extracted chemically from meteorites and were once interstellar particles. They have already been identified by their discoverers as supernova particles on the basis of their isotopic compositions, but we argue that they are from supernovae of Type Ia that explode with a cap of helium atop their CO structure. The relative abundances of the isotopes of C and Si and trace N, Mg, and Ca match those in the X particles without need of complicated and arbitrary mixing postulates. Furthermore, both C and Si abundances are enhanced and more abundant than O, which suggests that SiC is in fact the natural condensate of such matter. We also briefly address special issues relevant to the growth of dust within Type Ia interiors during their expansions.

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Documento generato il 26/11/20 alle ore 07:57:37