Computer Science – Numerical Analysis
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...442..758m&link_type=abstract
Astrophysical Journal (ISSN 0004-637X), vol. 442, no. 2, Part 1, p. 758-767
Computer Science
Numerical Analysis
30
Hall Effect, Numerical Analysis, Stellar Evolution, Stellar Interiors, Stellar Magnetic Fields, Stellar Models, White Dwarf Stars, Boundary Conditions, Decay Rates, Dipole Moments, Ohmic Dissipation
Scientific paper
We calculate the evolution of the magnetic fields in white dwarfs, taking into account the Hall effect. Because this effect depends nonlinearly upon the magnetic field strength B, the time dependences of the various multipole field components are coupled. The evolution of the field is thus significantly more complicated than has been indicated by previous investigations. Our calculations employ recent white dwarf evolutionary sequences computed for stars with masses 0.4, 0.6, 0.8, and 1.0 solar mass. We show that in the presence of a strong (up to approximately 109 G) internal toroidal magnetic field; the evolution of even the lowest order poloidal modes can be substantially changed by the Hall effect. As an example, we compute the evolution of an initially weak quadrupole component, which we take arbitrarily to be approximately 0.1%-1% of the strength of a dominant dipole field. We find that coupling provided by the Hall effect can produce growth of the ratio of the quadrupole to the dipole component of the surface value of the magnetic field strength by more than a factor of 10 over the 109 to 1010 year cooling lifetime of the white dwarf. Some consequences of these results for the process of magnetic-field evolution in white dwarfs are briefly discussed.
Muslimov Alex G.
Van Horn Hugh M.
Wood Matt A.
No associations
LandOfFree
Magnetic field evolution in white dwarfs: The hall effect and complexity of the field does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Magnetic field evolution in white dwarfs: The hall effect and complexity of the field, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic field evolution in white dwarfs: The hall effect and complexity of the field will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1828420