Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-05-30
Astronomy and Astrophysics
Astrophysics
Accepted for publication by the Astrophysical Journal
Scientific paper
10.1086/523095
We explore the dependence of pre-supernova evolution and supernova nucleosynthesis yields on the uncertainties in helium burning reaction rates. Using the revised solar abundances of Lodders (2003) for the initial stellar composition, instead of those of Anders & Grevesse (1989), changes the supernova yields and limits the constraints that those yields place on the 12C(a,g)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 alpha 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.
Austin Sam M.
Heger Alexander
Tur Clarisse
No associations
LandOfFree
On the Sensitivity of Massive Star Nucleosynthesis and Evolution to Solar Abundances and to Uncertainties in Helium Burning Reaction Rates does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with On the Sensitivity of Massive Star Nucleosynthesis and Evolution to Solar Abundances and to Uncertainties in Helium Burning Reaction Rates, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the Sensitivity of Massive Star Nucleosynthesis and Evolution to Solar Abundances and to Uncertainties in Helium Burning Reaction Rates will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-357454