Kirin Eldridge Posted April 26, 2015 Share Posted April 26, 2015 I am currently studying Cosmology in School, and was told that after a supernova there can still be some of the core remaining which becomes a superdense neutron star. I was also told that these spin with a frequency of 30.2Hz. Is there any particular reason for that frequency? Do all neutron stars spin at this rate, and why? Link to comment Share on other sites More sharing options...
Greg H. Posted April 26, 2015 Share Posted April 26, 2015 The spin rate varies by star. You can get some general information from Wikipedia on their spins, and why they spin as fast as they do. http://en.wikipedia.org/wiki/Neutron_star#Rotation Link to comment Share on other sites More sharing options...
swansont Posted April 26, 2015 Share Posted April 26, 2015 30.2 Hz is the frequency of rotation of the neutron star in the Crab nebula, the remnants of a fairly well-known supernova (viewed in 1054 AD), i.e. that was one specific example, rather than being a generally true claim. http://en.wikipedia.org/wiki/Crab_Nebula Link to comment Share on other sites More sharing options...
Enthalpy Posted April 26, 2015 Share Posted April 26, 2015 And observing this remnant at other wavelengths would be fantastic... Radiotelescopes tell exactly where it is, but in visible light, nothing, nada, niente, g'è minga - disappointing. Link to comment Share on other sites More sharing options...
imatfaal Posted April 26, 2015 Share Posted April 26, 2015 And observing this remnant at other wavelengths would be fantastic... Radiotelescopes tell exactly where it is, but in visible light, nothing, nada, niente, g'è minga - disappointing. Surely the Crab Pulsar is the one of the best known x-ray sources in the sky such that it is was once used as a test-bed for new telescopes http://physicsworld.com/cws/article/news/2011/jan/13/astronomers-say-goodbye-to-the-millicrab According to wiki the Crab Pulsar is one of 6 that CAN be observed optically http://en.wikipedia.org/wiki/Optical_pulsar And you can see the Nebula - which shines around the pulsar with a good camera or binoculars on a good night 2 Link to comment Share on other sites More sharing options...
Mordred Posted April 27, 2015 Share Posted April 27, 2015 The others answered the question on spin rate frequency, but didn't cover the question "what determines the spin rate" Take any star with spin, now decrease the stars radius. The spin rate will increase. Conservation of angular momentum. Think of a spinning figure skater that tucks in her arms. Link to comment Share on other sites More sharing options...
Enthalpy Posted April 27, 2015 Share Posted April 27, 2015 Oops, my bad. Thanks, +. Link to comment Share on other sites More sharing options...
acsinuk Posted May 6, 2015 Share Posted May 6, 2015 Mordren If the stars radius reduces then to maintain the angular momentum the spin rate must increase. Do you mean matter momentum or the magnetic momentum of that material? Link to comment Share on other sites More sharing options...
swansont Posted May 6, 2015 Share Posted May 6, 2015 What, pray tell, is magnetic momentum? 1 Link to comment Share on other sites More sharing options...
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