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Titolo: Sn 1987A revisited as a major production site for r-process elements
Autore: Tsujimoto, T; Shigeyama, T;
- Indirizzi:
- Natl Astron Observ, Mitaka, Tokyo 1818588, Japan Natl Astron Observ Mitaka Tokyo Japan 1818588 itaka, Tokyo 1818588, Japan Univ Tokyo, Grad Sch Sci, Res Ctr Early Universe, Bunkyo Ku, Tokyo 1130033, Japan Univ Tokyo Tokyo Japan 1130033 Universe, Bunkyo Ku, Tokyo 1130033, Japan
- Titolo Testata:
- ASTROPHYSICAL JOURNAL
fascicolo: 1,
volume: 561,
anno: 2001,
parte:, 2
pagine: L97 - L100
- SICI:
- 0004-637X(20011101)561:1<L97:S1RAAM>2.0.ZU;2-J
- Fonte:
- ISI
- Lingua:
- ENG
- Soggetto:
- METAL-POOR STARS; NEUTRON-CAPTURE NUCLEOSYNTHESIS; SUPERNOVA 1987A; CHEMICAL EVOLUTION; LIGHT-CURVE; X-RAY; SN-1987A; ABUNDANCES; PROGENITOR; BARIUM;
- Keywords:
- nuclear reactions, nucleosynthesis, abundances; stars : abundances; stars : Population II; supernovae : general; supernovae : individual (SN 1987A); supernova remnants;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Physical, Chemical & Earth Sciences
- Citazioni:
- 38
- Recensione:
- Indirizzi per estratti:
- Indirizzo: Tsujimoto, T Natl Astron Observ, Mitaka, Tokyo 1818588, Japan Natl Astron Observ Mitaka Tokyo Japan 1818588 1818588, Japan
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- Citazione:
- T. Tsujimoto e T. Shigeyama, "Sn 1987A revisited as a major production site for r-process elements", ASTROPHYS J, 561(1), 2001, pp. L97-L100
Abstract
The origin of nucleosynthesis products of rapid neutron capture reactions (the r-process) is a long-standing astrophysical problem. Recent analyses of elemental abundances for extremely metal-poor stars shed light on the elemental abundances of individual supernovae. Comparison of the abundance distributions of some extremely metal-poor stars with those of the best-observed supernova SN 1987A clearly indicates that the overabundances of barium and strontium found in SN 1987A that have been ascribed to the slow neutron capture process must be results of r-process nucleosynthesis. The mass of freshly synthesized barium in SN 1987A is estimated to be 6 x 10(-6) M. based on the observed surface abundance and detailed hydrodynamical models for this supernova. These new findings lead to the conclusion that 20 M. stars,one of which is the progenitor star of SN 1987A, are the predominant production sites for r-process elements in the Galaxy and the r-process element donors for notable neutron capture-rich giant stars, CS 22892-052 and CS 31082-001.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/05/13 alle ore 14:50:07