New insight into the magnetism of degenerate stars from the analysis of a volume-limited sample of white dwarfs

@article{Bagnulo2021NewII,
  title={New insight into the magnetism of degenerate stars from the analysis of a volume-limited sample of white dwarfs},
  author={Stefano Bagnulo and John D. Landstreet},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2021}
}
Many stars evolve into magnetic white dwarfs (MWDs), and observations may help to understand when the magnetic field appears at the stellar surface, if and how it evolves during the cooling phase, and, above all, what are the mechanisms that generate it. After obtaining new spectropolarimetric observations and combining them with previous literature data, we have checked almost the entire population of about 152 WDs within 20 pc from the Sun for the presence of magnetic fields, with a… 

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References

SHOWING 1-10 OF 149 REFERENCES

Discovery of six new strongly magnetic white dwarfs in the 20 pc local population

The sample of white dwarfs included in the local 20 pc volume documents, fairly accurately, the total production of white dwarfs over roughly 10 Gyr of stellar evolution in this part of the Milky Way

Searching for the weakest detectable magnetic fields in white dwarfs

Our knowledge of the magnetism in white dwarfs is based on an observational dataset that is biased in favour of stars with very strong magnetic fields. Most of the field measurements available in the

Magnetic White Dwarfs

In this paper we review the current status of research on the observational and theoretical characteristics of isolated and binary magnetic white dwarfs (MWDs).Magnetic fields of isolated MWDs are

Discovery of weak magnetic fields in four DZ white dwarfs in the local 20 pc volume

We report the discovery of weak magnetic fields in three white dwarfs within the local 20 pc volume (WD 0816−310, WD 1009−184, and WD 1532+129), and we confirm the magnetic nature of a fourth star

Can magnetic fields suppress convection in the atmosphere of cool white dwarfs? A case study on WD2105−820

Around 10 per cent of white dwarfs exhibit global magnetic structures with fields ranging from 1 kG to hundreds of MG. Recently, the first radiation magnetohydrodynamics simulations of the atmosphere

A fossil origin for the magnetic field in A stars and white dwarfs

TLDR
Numerical simulations show that stable magnetic field configurations, with properties agreeing with those observed, can develop through evolution from arbitrary, unstable initial fields, establishing fossil fields as the natural, unifying explanation for the magnetism of all these stars.

The True Incidence of Magnetism Among Field White Dwarfs

We study the incidence of magnetism in white dwarfs from three large and well-observed samples of hot, cool, and nearby white dwarfs in order to test whether the fraction of magnetic degenerates is

The incidence of magnetic fields in cool DZ white dwarfs

Little is known about the incidence of magnetic fields among the coolest white dwarfs. Their spectra usually do not exhibit any absorption lines as the bound-bound opacities of hydrogen and helium

Discovery of kilogauss magnetic fields in three DA white dwarfs

We have detected longitudinal magnetic fields between 2 and 4 kG in three (WD 0446−790, WD 1105−048, WD 2359−434) out of a sample of 12 normal DA white dwarfs by using optical spectropolarimetry done

A Search for Kilogauss Magnetic Fields in White Dwarfs and Hot Subdwarf Stars

We present new results of a survey for weak magnetic fields among DA white dwarfs, including some brighter hot subdwarf stars. We have detected variable circular polarization in the Hα line of the
...