Mean-field dynamo action in protoneutron stars

Details Mean-field dynamo action in protoneutron stars Mean-field dynamo action in protoneutron stars

2003-09-29

arxiv.org/abs/astro-ph/0309783v1

Astron.Astrophys.410:L33,2003; Astron.Astrophys.410:L33-L36,2003

Astronomy and Astrophysics

Astrophysics

A&A Letters, in press

Scientific paper

10.1051/0004-6361:20031459

We have investigated the turbulent mean-field dynamo action in protoneutron stars that are subject to convective and neutron finger instabilities. While the first one develops mostly in the inner regions of the star, the second one is favoured in the outer regions, where the Rossby number is much smaller and a mean-field dynamo action is more efficient. By solving the mean-field induction equation we have computed the critical spin period below which no dynamo action is possible and found it to be ~1 s for a wide range of stellar models. Because this critical period is substantially longer than the characteristic spin period of very young pulsars, we expect that a mean-field dynamo will be effective for most protoneutron stars.

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