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Titolo:
EXPLOSIONS OF SUB-CHANDRASEKHAR MASS WHITE-DWARFS IN 2 DIMENSIONS
Autore:
LIVNE E; ARNETT D;
Indirizzi:
HEBREW UNIV JERUSALEM,RACAH INST PHYS IL-91904 JERUSALEM ISRAEL UNIV ARIZONA,STEWARD OBSERV TUCSON AZ 85721
Titolo Testata:
The Astrophysical journal
fascicolo: 1, volume: 452, anno: 1995,
parte:, 1
pagine: 62 - 74
SICI:
0004-637X(1995)452:1<62:EOSMWI>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
IA SUPERNOVAE; HELIUM SHELLS; LIGHT-CURVE; DETONATIONS;
Keywords:
DISTANCE SCALE; HYDRODYNAMICS; NUCLEAR REACTIONS, NUCLEOSYNTHESIS, ABUNDANCES; STARS, ABUNDANCES; SUPERNOVAE, GENERAL; WHITE DWARFS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
30
Recensione:
Indirizzi per estratti:
Citazione:
E. Livne e D. Arnett, "EXPLOSIONS OF SUB-CHANDRASEKHAR MASS WHITE-DWARFS IN 2 DIMENSIONS", The Astrophysical journal, 452(1), 1995, pp. 62-74

Abstract

The hydrodynamics of detonations of white dwarfs, having a carbon-oxygen core and a helium envelope, are examined in a two-dimensional geometry. Various combinations of the masses of the CO core and the overlying He layer are examined. Nuclear burning is directly computed with an alpha network from C-12 to Ni-56 as a part of the hydrodynamic calculation. The nucleosynthesis yield is similar to that needed for Type Ia supernovae to explain the variation in alpha elements relative to iron in Population II stars. Significant amounts of radioactive Ti-44 produced. The yields are similar to those predicted from one-dimensionalcomputations, despite the very nonspherical hydrodynamic behavior. Light curves are simulated and compared to observations of Type Ia supernovae. The observed variation in peak absolute luminosity and in post-maximum decline rate is reproduced in a natural way. A rough comparison of predicted velocities with observations of Ca II H and K, Mg II lambda 4481 and Si II lambda 6355 in SN 1989B (in NGC 3627) is promising; implications for the use of Type Ia supernovae as distance indicators are discussed, and the key importance of spectral synthesis is stressed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/11/20 alle ore 07:40:10