Astrophysics and Space Science

, Volume 15, Issue 1, pp 153–160 | Cite as

Accretion of matter by condensed objects

  • F. Curtis Michel


The equations of motion for steady-state spherical symmetric flow of matter into or out of a condensed object (e.g. neutron stars, ‘black holes’, etc.) are displayed and solved for simple polytropic gases. It appears that infalling matter may be heated as hot as 1012K and that X-ray luminosities of the order of 1037 erg s−1 could result. The two fluid (electrons and ions separately) approach is also examined and it is shown that electrostatic fields of the order of 105 V m−1 are required near the surface of the object. Such fields are not strong enough to significantly modify the space-time metric.


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Copyright information

© D. Reidel Publishing Company 1972

Authors and Affiliations

  • F. Curtis Michel
    • 1
  1. 1.Space Science DepartmentRice UniversityHoustonUSA

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