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Nucleosynthesis in Massive Stars and Supernovae

Nucleosynthesis in Massive Stars and ..

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Nucleosynthesis and supernovae in massive stars …

These examples andothers will be discussed along with predictions of the masses of blackholes and neutron stars to be produced in our Galaxy by Type IIsupernovae.

Nucleosynthesis and supernovae in massive stars; ..

For the rst time heavy element nucleosynthesis in the magneto- hydrodynamical (MHD) explosions of core-collapse supernovae are investigated using a massive star of 13M in a main sequence stage. Contrary to the case of the spherical explosion, jet-like explosion due to the combined effects of the rotation and magnetic eld lowers the electron fraction signicantly inside the layers above the Fe-core. Then, the anisotropic shock waves pass through the oxygen rich layers. As a consequence, we nd that the nucleosynthesis of the r- and p-process proceeds appreciably compared to the models previously considered.

Nucleosynthesis and supernovae in massive ..

Hoffman R D and Woosley S E 2002 Nucleosynthesis in massive stars …

We explore the dependence of presupernova evolution and supernova nucleosynthesis yields on the uncertainties in helium-burning reaction rates. Using the revised solar abundances of Lodders for the initial stellar composition, instead of those of Anders and Grevesse, changes the supernova yields and limits the constraints that those yields place on the 12C(α, γ)16O reaction rate. The production factors of medium-weight elements (A = 16-40) were found to be in reasonable agreement with observed solar ratios within the current experimental uncertainties in the triple-α reaction rate. Simultaneous variations by the same amount in both reaction rates or in either of them separately, however, can induce significant changes in the central 12C abundance at core carbon ignition and in the mass of the supernova remnant. It therefore remains important to have experimental determinations of the helium-burning rates so that their ratio and absolute values are known with an accuracy of 10% or better.

N2 - We explore the dependence of presupernova evolution and supernova nucleosynthesis yields on the uncertainties in helium-burning reaction rates. Using the revised solar abundances of Lodders for the initial stellar composition, instead of those of Anders and Grevesse, changes the supernova yields and limits the constraints that those yields place on the 12C(α, γ)16O reaction rate. The production factors of medium-weight elements (A = 16-40) were found to be in reasonable agreement with observed solar ratios within the current experimental uncertainties in the triple-α reaction rate. Simultaneous variations by the same amount in both reaction rates or in either of them separately, however, can induce significant changes in the central 12C abundance at core carbon ignition and in the mass of the supernova remnant. It therefore remains important to have experimental determinations of the helium-burning rates so that their ratio and absolute values are known with an accuracy of 10% or better.

Supernova nucleosynthesis massive stars / Gatsby color essay

We thus review the recent results of the nucleosynthesis yields of mainly massive stars ..

I1.04While the idea that the chemical elements find their origin in the starsstretches back to the early part of the century, it was Fowler and Hoylewho emphasized the role of massive stars, designated and explored thetwo types of theoretical models for supernovae still employed(degenerate thermonuclear explosion and iron core collapse for Type Iand II, respectively), and began the quantitative calculation of stellarnucleosynthesis.

AB - For the rst time heavy element nucleosynthesis in the magneto- hydrodynamical (MHD) explosions of core-collapse supernovae are investigated using a massive star of 13M⊙ in a main sequence stage. Contrary to the case of the spherical explosion, jet-like explosion due to the combined effects of the rotation and magnetic eld lowers the electron fraction signicantly inside the layers above the Fe-core. Then, the anisotropic shock waves pass through the oxygen rich layers. As a consequence, we nd that the nucleosynthesis of the r- and p-process proceeds appreciably compared to the models previously considered.

connect to download. Get pdf. Nucleosynthesis from massive rotating stars
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We finally know what elements are contained in an …

AB - We explore the dependence of presupernova evolution and supernova nucleosynthesis yields on the uncertainties in helium-burning reaction rates. Using the revised solar abundances of Lodders for the initial stellar composition, instead of those of Anders and Grevesse, changes the supernova yields and limits the constraints that those yields place on the 12C(α, γ)16O reaction rate. The production factors of medium-weight elements (A = 16-40) were found to be in reasonable agreement with observed solar ratios within the current experimental uncertainties in the triple-α reaction rate. Simultaneous variations by the same amount in both reaction rates or in either of them separately, however, can induce significant changes in the central 12C abundance at core carbon ignition and in the mass of the supernova remnant. It therefore remains important to have experimental determinations of the helium-burning rates so that their ratio and absolute values are known with an accuracy of 10% or better.

How are light and heavy elements formed

N2 - For the rst time heavy element nucleosynthesis in the magneto- hydrodynamical (MHD) explosions of core-collapse supernovae are investigated using a massive star of 13M⊙ in a main sequence stage. Contrary to the case of the spherical explosion, jet-like explosion due to the combined effects of the rotation and magnetic eld lowers the electron fraction signicantly inside the layers above the Fe-core. Then, the anisotropic shock waves pass through the oxygen rich layers. As a consequence, we nd that the nucleosynthesis of the r- and p-process proceeds appreciably compared to the models previously considered.

Order now
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