A stellar remnant is the object left after a star finishes its principal nuclear-burning evolution, such as a white dwarf, neutron star or black hole. Stellar remnants retain mass while often contributing little optical light, affecting an old stellar population's mass-to-light ratio.
A dense stellar-scale object such as a white dwarf, neutron star or stellar-mass black hole. accretion releases a large gravitational binding energy per unit mass because the accreting surface or inner orbit is small. A black hole has no material surface, so its radiative yield depends on the accretion flow rather than surface impact.
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