Why do Neutron Stars have a Magnetic Field?

Click For Summary

Discussion Overview

The discussion revolves around the presence of magnetic fields in neutron stars, particularly focusing on the question of how these fields arise despite neutron stars being primarily composed of neutrons, which are electrically neutral. The scope includes theoretical explanations and conceptual clarifications related to astrophysics.

Discussion Character

  • Exploratory, Conceptual clarification

Main Points Raised

  • Some participants express confusion regarding the existence of magnetic fields in neutron stars, questioning the necessity of charged particles for magnetic field generation.
  • One participant clarifies that neutron stars are not composed entirely of neutrons and that charged particles are present on the surface, contributing to radiation, especially in pulsars.
  • Another participant mentions that the strong magnetic fields and rapid rotation of young neutron stars result from the contraction of the initial stellar core, with conservation of angular momentum and magnetic flux playing key roles.
  • A participant shares a link to additional information, noting its relevance to the topic, though it does not directly answer the original question.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the initial question; while some clarifications are provided, confusion remains regarding the relationship between neutron composition and magnetic fields.

Contextual Notes

The discussion does not resolve the underlying assumptions about the composition of neutron stars or the mechanisms behind magnetic field generation.

axel65
Messages
3
Reaction score
0
We were having a little chat in my physics lesson about neutron stars for our A level course, and nobody really understood why neutron stars have a magnetic field if they are consist of neutrons, which are obviously neutral charge. We thought that you needed charged particles to create a magnetic field?

Alex Gawthrope
 
Astronomy news on Phys.org
A neutron star is actually not composed entirely of neutrons. On the surface, in particular, charged particles are abundant, producing a great deal of radiation in the case of pulsars. The strong magnetic fields and rapid rotation of young neutron stars both arise from the contraction of the initial stellar core. A small rotation rate for the core will, by conservation of angular momentum, result in a rapidly rotating neutron star. Similarly, a small magnetic field in the stellar core will be greatly amplified by conservation of magnetic flux during the contraction.
 
Thank you, I'll let the class know on Monday.
 

Similar threads

  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 10 ·
Replies
10
Views
2K
  • · Replies 0 ·
Replies
0
Views
3K
  • · Replies 28 ·
Replies
28
Views
4K
  • · Replies 6 ·
Replies
6
Views
3K
  • · Replies 44 ·
2
Replies
44
Views
4K
  • · Replies 26 ·
Replies
26
Views
5K
  • · Replies 17 ·
Replies
17
Views
6K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 8 ·
Replies
8
Views
3K