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supernova_2 - Neutron star companions Most stars would...

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Pulsars Is a neutron star that beams radiation along a magnetic axis that is not aligned with the radiation axis. The radiation beams sweep through space like lighthouse beams as the neutron star rotates A neutron star will be a pulsar if… 1) magnetic axis is inclined relative to its axis 2) beamed radiation points toward us Could there be neutron stars that appear as pulsars to other civilization but not to us? -----yes! Why must pulsars be neutron stars ? The most rapidly spinning pulsars have periods of 1-10 milliseconds The only way gravity could hold something together spinning that is if it has the density of atomic nuclei
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Unformatted text preview: Neutron star companions Most stars would survive its companion’s massive star supernova Typically produce a neutron star-main seq. star binary Several even have planets ! Periodic changes in the pulse of PSR 1257T 12 identified 3 planets orbiting it. These were the first extra solar planets ever discovered Mass transfer in close binaries Matter falling toward a neutron star will form an accretion disk, just as in a white dwarf binary Mostly H and He Accreting matter adds angular momentum to a neutron star, increasing its spin Many of the most rapidly rotating pulsars are in the binary stars....
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