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Titolo:
The role of Z=0 AGB stars on the early chemical enrichment
Autore:
Dominguez, I; Abia, C; Straniero, O; Chieffi, A; Limongi, M;
Indirizzi:
Univ Granada, Granada, Spain Univ Granada Granada SpainUniv Granada, Granada, Spain Osservatorio Astron Collurania, Teramo, Italy Osservatorio Astron Collurania Teramo Italy n Collurania, Teramo, Italy CNR, Ist Astrofis Spaziale, Rome, Italy CNR Rome ItalyCNR, Ist Astrofis Spaziale, Rome, Italy Osservatorio Astron Roma, Monteporzio, Italy Osservatorio Astron Roma Monteporzio Italy ron Roma, Monteporzio, Italy
Titolo Testata:
NUCLEAR PHYSICS A
fascicolo: 1-2, volume: 688, anno: 2001,
pagine: 399C - 401C
SICI:
0375-9474(20010521)688:1-2<399C:TROZAS>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
MASS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
5
Recensione:
Indirizzi per estratti:
Indirizzo: Dominguez, I Univ Granada, Granada, Spain Univ Granada Granada SpainUniv Granada, Granada, Spain
Citazione:
I. Dominguez et al., "The role of Z=0 AGB stars on the early chemical enrichment", NUCL PHYS A, 688(1-2), 2001, pp. 399C-401C

Abstract

We present theoretical evolutionary models for Z = 0 stars in the mass range 4 less than or equal to M/M circle dot less than or equal to 8 from the pre-main sequence up to the AGE phase. Contrary to previous calculations wefound that these stars develop normal thermal pulses and third dredge-up episodes. Special attention is devoted to analyze the chemical enrichment inthe envelope due to the above mechanisms. As a consequence, we show that these stars become carbon and nitrogen rich. Using different IMFs proposed in the literature for the Population III stars, we study their contribution to the pre-galactic chemical enrichment. It is found that Z = 0 AGE stars could significantly contribute to Li-7, C-12 and N-14 and produce extreme non-solar Mg-24/Mg-25/Mg-26 ratios. However, the net contribution is very sensitive to the IMF adopted and to the fraction of primordial matter which goes into stars.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 13:21:49