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The Impact of Neutrino Magnetic Moments on the Evolution of Massive Stars
Alexander Heger, Alexander Friedland, Maurizio Giannotti +1
We explore the sensitivity of massive stars to neutrino magnetic moments. We find that the additional cooling due to the neutrino magnetic moments bring about qualitative changes t…
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…
Models of Type I X-ray Bursts from GS 1826-24: A Probe of rp-Process Hydrogen Burning
Alexander Heger, Andrew Cumming, Duncan K. Galloway +1
The X-ray burster GS 1826-24 shows extremely regular Type I X-ray bursts whose energetics and recurrence times agree well with thermonuclear ignition models. We present calculation…
The Metallicity Dependence of Wolf-Rayet Mass Loss
A. J. Onifer, A. Heger, J. Abdallah
We produce models of early WN, WC, and WO stars as a function of metallicity Z using an analytic CAK-type approach. At log(Z / Z_sun) >= -2 both WN and WC stars have the approximat…