منابع مشابه
Nucleosynthesis in Type Ii Supernovae
Presupernova evolution and explosive nucleosynthesis in massive stars for main-sequence masses from 13 M ⊙ to 70 M ⊙ are calculated. We examine the dependence of the super-nova yields on the stellar mass, 12 C(α, γ) 16 O rate, and explosion energy. The supernova yields integrated over the initial mass function are compared with the solar abundances.
متن کاملNucleosynthesis in Type Ia Supernovae
Among the major uncertainties involved in the Chandrasekhar mass models for Type Ia supernovae are the companion star of the accreting white dwarf (or the accretion rate that determines the carbon ignition density) and the flame speed after ignition. We present nucleosynthesis results from relatively slow deflagration (1.5 3 % of the sound speed) to constrain the rate of accretion from the comp...
متن کاملExplosive Nucleosynthesis in Axisymmetrically Deformed Type II Supernovae
Explosive nucleosynthesis under the axisymmetric explosion in Type II supernova has been performed by means of two dimensional hydrodynamical calculations. We have compared the results with the observations of SN 1987A. Our chief findings are as follows: (1) Ti is synthesized so much as to explain the tail of the bolometric light curve of SN 1987A. We think this is because the alpha-rich freeze...
متن کاملThe Reaction Rate Sensitivity of Nucleosynthesis in Type II Supernovae
We explore the sensitivity of the nucleosynthesis of intermediate mass elements (28 ≤ A <∼80) in supernovae derived from massive stars to the nuclear reaction rates employed in the model. Two standard sources of reaction rate data (Woosley et al. 1978; and Thielemann et al. 1987) are employed in pairs of calculations that are otherwise identical. Two stellar models are calculated for each of tw...
متن کاملNucleosynthesis in Type Ii Supernovae and the Abundances in Metal-poor Stars
We explore the effects on nucleosynthesis in Type II supernovae of various parameters (mass cut, neutron excess, explosion energy, progenitor mass) in order to explain the observed trends of the ironpeak element abundance ratios ([Cr/Fe], [Mn/Fe], [Co/Fe] and [Ni/Fe]) in halo stars as a function of metallicity for the range −4 ≤ [Fe/H] ≤ −2.5. [Cr/Fe] and [Mn/Fe] decrease with decreasing [Fe/H]...
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ژورنال
عنوان ژورنال: Nuclear Physics A
سال: 1997
ISSN: 0375-9474
DOI: 10.1016/s0375-9474(97)00076-6