Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
The galactic lithium evolution revisited
Autore:
Romano, D; Matteucci, F; Molaro, P; Bonifacio, P;
Indirizzi:
SISSA, ISAS, I-34014 Trieste, Italy SISSA Trieste Italy I-34014SISSA, ISAS, I-34014 Trieste, Italy Osservatorio Astron Trieste, I-34131 Trieste, Italy Osservatorio Astron Trieste Trieste Italy I-34131 I-34131 Trieste, Italy Univ Trieste, Dipartimento Astron, I-34131 Trieste, Italy Univ Trieste Trieste Italy I-34131 imento Astron, I-34131 Trieste, Italy
Titolo Testata:
ASTRONOMY AND ASTROPHYSICS
fascicolo: 1, volume: 352, anno: 1999,
pagine: 117 - 128
SICI:
0004-6361(199912)352:1<117:TGLER>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
METAL-POOR STARS; SOLAR-TYPE STARS; HALO-STARS; CLASSICAL NOVAE; RED GIANTS; ABUNDANCE; DWARFS; GALAXY; LI-7; NUCLEOSYNTHESIS;
Keywords:
galaxy : abundances; galaxy : evolution; galaxy : solar neighbourhood;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
84
Recensione:
Indirizzi per estratti:
Indirizzo: Romano, D SISSA, ISAS, Via Beirut 2-4, I-34014 Trieste, Italy SISSA Via Beirut 2-4 Trieste Italy I-34014 34014 Trieste, Italy
Citazione:
D. Romano et al., "The galactic lithium evolution revisited", ASTRON ASTR, 352(1), 1999, pp. 117-128

Abstract

The evolution of the Li-7 abundance in the Galaxy has been computed by means of the two-infall model of Galactic chemical evolution. We took into account several stellar Li-7 sources: novae, massive AGE stars, C-stars and Type II SNe, In particular, we adopted new theoretical yields for novae. We also took into account the Li-7 production from GCRs, In particular, the absolute yields of Li-7, as suggested by a recent reevaluation of the contribution of GCR spallation to the Li-7 abundance, have been adopted. We compared our theoretical predictions for the evolution of Li-7 abundance in the solar neighborhood with a new compilation of data, where we identified the population membership of the stars on a kinematical basis, A critical analysis of extant observations revealed a possible extension of the Li-7 plateau towards higher metallicities (up to [Fe/H] similar to -0.5 or even -0.3) with a steep rise afterwards. We conclude that 1) the Li-7 contribution from novae is required in order to reproduce the shape of the growth of A(Li) versus [Fe/H], 2) the contribution from Type II SNe should be lowered by at least a factor of two, and 3) the Li-7 production from GCRs is probably more important than previously estimated, in particular at high metallicities: by taking into account GCR nucleosynthesis we noticeably improved the predictions on the Li-7 abundance in the presolar nebula and at the present time as inferred from measures in meteorites and T Tauri stars, respectively. We also predicted a lower limit for the present time Li-7 abundance expected in the bulge, a predictionwhich might be tested by future observations.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/09/20 alle ore 07:20:27