Models of Type I X-Ray Bursts from 4U 1820–30

@article{Cumming2003ModelsOT,
  title={Models of Type I X-Ray Bursts from 4U 1820–30},
  author={Andrew Cumming},
  journal={The Astrophysical Journal},
  year={2003},
  volume={595},
  pages={1077-1085}
}
  • A. Cumming
  • Published 11 June 2003
  • Physics
  • The Astrophysical Journal
I present ignition models for type I X-ray bursts and superbursts from the ultracompact binary 4U 1820-30. A pure helium secondary is usually assumed for this system (which has an orbital period ?11 minutes); however, some evolutionary models predict a small amount of hydrogen in the accreted material (mass fraction X ~ 0.1). I show that the presence of hydrogen significantly affects the type I burst recurrence time if X 0.03 and the CNO mass fraction 3 ? 10-3. When regularly bursting, the… 

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