Relativistic Stars and the Schwarzschild Solution
Relativistic Stars and the Schwarzschild Solution
Relativistic Stars and the Schwarzschild Solution
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Astrophysical Consequ of ISCO<br />
• The surface of a neutron star is around <strong>the</strong><br />
ISCO, probably inside for M > 1.3 M S .<br />
• Accretion disks can only exist downto <strong>the</strong> ISCO,<br />
since motion in <strong>the</strong> disk is essentially Keplerian<br />
(circular orbits).<br />
• Binding energy of ISCO determines <strong>the</strong><br />
accretion efficiency η = 1 – E ISCO = 6% (Schw.)<br />
• Angular momentum L = (12) 1/2 GM/c at ISCO is<br />
accreted onto <strong>the</strong> neutron star or Black Hole<br />
� Spinning up of NSs <strong>and</strong> BHs by accretion!
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