Long Type I X-Ray Bursts and Neutron Star Interior Physics

@article{Cumming2006LongTI,
  title={Long Type I X-Ray Bursts and Neutron Star Interior Physics},
  author={Andrew Cumming and Jared Macbeth and Jean in 't Zand and Dany Page},
  journal={The Astrophysical Journal},
  year={2006},
  volume={646},
  pages={429-451}
}
Two types of long-duration type I X-ray bursts have been discovered by long-term monitoring observations of accreting neutron stars: superbursts and ``intermediate duration'' bursts. We investigate the sensitivity of their ignition conditions to the interior thermal properties of the neutron star. First, we compare the observed superburst light curves to cooling models. Our fits require ignition column depths in the range (0.5-3) ? 1012 g cm-2 and an energy release ?2 ? 1017 ergs g-1. The… 
Sedimentation and Type I X-Ray Bursts at Low Accretion Rates
Neutron stars, with their strong surface gravity, have interestingly short timescales for the sedimentation of heavy elements. Motivated by observations of Type I X-ray bursts from sources with
SUPERBURST MODELS FOR NEUTRON STARS WITH HYDROGEN- AND HELIUM-RICH ATMOSPHERES
Superbursts are rare day-long type I X-ray bursts due to carbon flashes on accreting neutron stars in low-mass X-ray binaries. They heat the neutron star envelope such that the burning of accreted
Super-Eddington Winds from Type I X-Ray Bursts
We present hydrodynamic simulations of spherically symmetric super-Eddington winds from radius-expansion type I X-ray bursts. Previous studies assumed a steady-state wind and treated the mass-loss
Constraining the properties of neutron star crusts with the transient low-mass X-ray binary Aql X-1
Aql X-1 is a prolific transient neutron star low-mass X-ray binary that exhibits an accretion outburst approximately once every year. Whether the thermal X-rays detected in intervening quiescent
Carbon synthesis in steady-state hydrogen and helium burning on accreting neutron stars
Superbursts from accreting neutron stars probe nuclear reactions at extreme densities ( 10 9 g cm 3 ) and temperatures (T > 10 9 K). These bursts ( 1000 times more energetic than type I X-ray bursts)
Hydrogen-triggered Type I X-Ray Bursts in a Two-Zone Model
We use the two-zone model of Cooper & Narayan to study the onset and time evolution of hydrogen-triggered type I X-ray bursts on accreting neutron stars. At the lowest accretion rates, thermally
Discovery of Transition from Marginally Stable Burning to Unstable Burning after a Superburst in Aql X-1
Superbursts are long duration, rare, and extremely energetic thermonuclear explosions of neutron star low-mass X-ray binaries (NS LMXBs), which are proposed to be due to unstable carbon ignition. We
A DIRECT MEASUREMENT OF THE HEAT RELEASE IN THE OUTER CRUST OF THE TRANSIENTLY ACCRETING NEUTRON STAR XTE J1709−267
The heating and cooling of transiently accreting neutron stars provides a powerful probe of the structure and composition of their crust. Observations of superbursts and cooling of accretion-heated
Thermonuclear (Type I) X-Ray Bursts Observed by the Rossi X-Ray Timing Explorer
We have assembled a sample of 1187 thermonuclear (type I) X-ray bursts from observations of 48 accreting neutron stars by the Rossi X-ray Timing Explorer, spanning more than 10 years. The sample
Multi-Zone Models of Superbursts from Accreting Neutron Stars
Superbursts are rare and energetic thermonuclear carbon flashes observed to occur on accreting neutron stars. We create the first multi-zone models of series of superbursts using a stellar evolution
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