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I Vibrations of astronomical bodies

  1. Oct 21, 2017 #1
    Pulsars are known to rotate at very predictable frequencies. If a beep or short tone is assigned to each rotation, the spin of the star can be 'sonified'. Pulsars spin anywhere from a few fractions of times per second to over 600 per second. 600 cycles is audible in the human range of hearing. However if the spin were anything over 20,000 times per second, it would cease to be audible, naturally, to the human ear.

    What celestial objects do we know of that spin, orbit or otherwise vibrate naturally at a rate between 20 times per second and 20,000?
  2. jcsd
  3. Oct 21, 2017 #2


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  4. Oct 21, 2017 #3


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    Only very dense objects like neutron stars and black holes, as far as I know. Less-dense objects would be torn apart from tidal or centrifugal forces.
  5. Oct 21, 2017 #4
    Thank you, that is very insightful information. And that narrows my search drastically! So that means there's a relationship to an object's density and its capacity to spin?
  6. Oct 21, 2017 #5


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    Yes there is. @Drakkith is right.
  7. Oct 21, 2017 #6
    Are we talking about the Roche limit?
  8. Oct 21, 2017 #7
  9. Oct 22, 2017 #8
    With an inherent lower frequency limit but without an inherent upper limit. However, high frequencies are poorly resonated.
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