The Naked Scientists

The Naked Scientists Forum

Author Topic: Seismic study of Pulsars?  (Read 1366 times)

Online evan_au

  • Neilep Level Member
  • ******
  • Posts: 4103
  • Thanked: 245 times
    • View Profile
Seismic study of Pulsars?
« on: 04/07/2012 14:03:33 »
What is the speed of sound in "Neutronium" (the stuff of pulsars)?
Would it be possible to study the internal structure of pulsars by observing the impact of seismographic echoes from "starquakes" on the rotational speed of a pulsar?


 

Offline graham.d

  • Neilep Level Member
  • ******
  • Posts: 2208
    • View Profile
Re: Seismic study of Pulsars?
« Reply #1 on: 04/07/2012 15:02:18 »
There are anomolous changes to the rotation speed of Pulsars that is not understood as far as I know. This is other than the gradual slowing down and is a sudden increase in the rotation speed which returns to its previous state after a time. This may be the best indicator of something going on within the neutron star's substructure which comprises not just neutrons but, as you allude to, a more complex set of layers with neutron and proton superfluids, some sort of core material and maybe some crystaline surface.
 

Offline imatfaal

  • Neilep Level Member
  • ******
  • Posts: 2787
  • rouge moderator
    • View Profile
Re: Seismic study of Pulsars?
« Reply #2 on: 05/07/2012 12:07:13 »
The nearest pulsar is around 500 light years from earth - so the data we have is severely constrained.  if we knew of a seismic event which happened many hundreds of years ago - we may be able to glean some information from the signal changes/variations we can presently observe in the pulsar's light.  but all we have is the pulsars light.  So astro-seismology is a practised science - even with exotic stars, but other than Sol we have limited data.  That said this is a thriving discipline - see http://en.wikipedia.org/wiki/Neutron-star_oscillation

Our study of the internal structure is also based on our knowledge of quantum mechanics and is quite complex even for such an incredibly simple object as a neutron star
 

Online evan_au

  • Neilep Level Member
  • ******
  • Posts: 4103
  • Thanked: 245 times
    • View Profile
Re: Seismic study of Pulsars?
« Reply #3 on: 07/07/2012 13:14:49 »
Thanks, imatfaal.
It seems that with the fastest neutron star pulses occurring at intervals >1ms, many of the oscillation modes < 1ms would not be observable from the pulses.
However, some of the longer-period oscillations may be observable, someday.
 

The Naked Scientists Forum

Re: Seismic study of Pulsars?
« Reply #3 on: 07/07/2012 13:14:49 »

 

SMF 2.0.10 | SMF © 2015, Simple Machines
SMFAds for Free Forums