PCS 181 Lecture Notes - Lecture 6: Radiography, Stellar Black Hole, Cygnus X-1

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The manner of death is determined by the star"s mass. Planetary nebula : no more nuclear reactions in the core of star. (shinning because the heat but not the reactions) Diagram: the white dwarf has no nuclear reactions in the core and shines by remnant heat left over from when it was an active star. It will no longer has a central energy source. Magnetic lines of the earth (cause the aurora) Typical neutron star : period: 0. 1 to 4s, we know of ~ 500 pulsars. Scape velocity: minimum velocity required to escape the gravitational pull of a massive object, the gravitational constant is g = 6. 67 (cid:883)(cid:882) (cid:2869)(cid:2869)(cid:1866) (cid:1865)(cid:2870)/(cid:2870) Determine the radius of its event horizon (= radius of the black hole) Youtube) (cid:3032)(cid:3046)(cid:3030)=((cid:884)(cid:1839) )(cid:2869)(cid:2870: (cid:1839)(cid:3028)(cid:3045)(cid:3047) =(cid:888) (cid:883)(cid:882)(cid:2870)(cid:2872, (cid:3028)(cid:3045)(cid:3047) =(cid:888). (cid:886) (cid:883)(cid:882)(cid:2874) (cid:1865) (cid:3032)(cid:3046)(cid:3030)=((cid:884)(cid:1839) )(cid:2869)(cid:2870) (cid:3032)(cid:3046)(cid:3030)=(cid:4678)(cid:884) (cid:888). (cid:888)(cid:889) (cid:883)(cid:882) (cid:2869)(cid:2869)(cid:4666)(cid:888) (cid:883)(cid:882)(cid:2870)(cid:2872)(cid:4667) (cid:4666)(cid:888). (cid:886) (cid:883)(cid:882)(cid:2874)(cid:4667, we re-arrange the previous equation for radius,

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