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Dependence of S-Process Nucleosynthesis in Massive Stars on Triple-Alpha and 12C(a,g)16O Reaction Rate Uncertainties
Clarisse Tur, Alexander Heger, Sam M. Austin
We have studied the sensitivity of s-process nucleosynthesis in massive stars to +/- 2 sigma variations in the rates of the triple alpha and 12C(a,g)16O reactions. We simulated the…
Multiple ring nebulae around blue supergiants
S. M. Chita, N. Langer, A. J. van Marle +2
In the course of the life of a massive star, wind-wind interaction can give rise to the formation of circumstellar nebulae which are both predicted and observed in the nature. We p…
The Molecular Hydrogen Deficit in Gamma-Ray Burst Afterglows
Daniel Whalen, Jason X. Prochaska, Alexander Heger +1
Recent analysis of five gamma-ray burst (GRB) afterglow spectra reveal the absence of molecular hydrogen absorption lines, a surprising result in light of their large neutral hydro…