SCI 102 Lecture Notes - Lecture 17: Large Magellanic Cloud, Sn 1987A, Event Horizon
13 Apr 2016
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Mass range: 1. 4 mo < mns < ~3 mo. Size ~ 20 100 km across ~ about the size of a city. Density similar to that of an atomic nucleus: ~1017 kg/m3 to 1018 kg/m3. Temperature: ~ 10 x106 k on surface. Discovered/reported from chile by ian shelton, an observer from uoft. Occurred in the large magellanic cloud = an irregular galaxy near mw at ~ The progenitor star was a blue giant star, sanduleak. Huge neutrino bursts detected by earth-based equipment. This particular sn event has been studied from the actual explosion to the present day. < ~ 5% of stars are > ~ 25mo. Star undergoes several red giant phases, producing ever-heavier elements in the core. When the star has an iron core, it goes supernova , but if the collapsed core is 3mo it cannot resist the pull of gravity and collapses to a black hole (singularity) Consists of the central singularity and event horizon boundary.
