Small strange stars and marginally stable orbit in Newtonian theory

@article{Zdunik2001SmallSS,
  title={Small strange stars and marginally stable orbit in Newtonian theory},
  author={Julian Leszek Zdunik and E. Gourgoulhon},
  journal={Physical Review D},
  year={2001},
  volume={63}
}
It is shown that for very rapidly rotating low mass strange stars the marginally stable orbit is located above the stellar surface. This effect is explained by the very important role of the oblateness of the rotating strange star. The comparison with some ``academic'' examples is presented. This feature is purely Newtonian in its nature and has nothing to do with relativistic marginally stable orbit. The effect is very large and cannot be treated in a perturbative way. It seems that strange… 
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Methods Citations
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References

SHOWING 1-10 OF 16 REFERENCES
Astron. Astrophys
  • Astron. Astrophys
  • 2000
Astron
  • Astrophys. 356, 612
  • 2000
Astron. Astrophys
  • Astron. Astrophys
  • 1994
Astrophys. J. Lett
  • Astrophys. J. Lett
  • 1999
Astrophys . J
  • Astrophys . J
  • 1998
Astron . Astrophys
  • Astron . Astrophys
  • 1999
Astrophys. J
  • Astrophys. J
  • 1985
Astron. Astrophys
  • Astron. Astrophys
  • 1999
Phys. Rev. D
  • Phys. Rev. D
  • 1998
Astrophys
  • J. 509, 793
  • 1998
...
...