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Abstract <p>The results of the latest study of the thermal evolution featuresof white dwarfs with large surface magnetic fields are presented.The main objective of the work is to test the hypothesis that forcooling degenerate stars—white dwarfs (WD)—the stopping ofexternal convection by a magnetic field greater than one megagausssignificantly slows down their cooling. For this purpose, theobserved luminosity function of WDs with surface fields greaterthan one megagauss is constructed in a volume with a 20&#xa0;pc radius20&#xa0;pc and compared to the known similar luminosity function of allWDs, regardless of their magnetic field values. The generaltendency—a significant increase in the frequency of occurrenceof magnetic white dwarfs (MWDs) with an increase in their absolutebolometric magnitude (a decrease in brightness) is confirmed.Empirical modeling of the effect of magnetically inducedsuppression of convection on the luminosity function of stronglymagnetized WDs also showed an increase in their frequency withage, although with a shift of one stellar magnitude toward weakermagnitudes. This shift is a consequence of the imperfection of themodel. The effect of an increase in the frequency of occurrence ofstrongly magnetized WDs with age cannot be explained either by asystematic difference in the masses of magnetic and non-magnetic(with magnetic fields below the detection limit) WDs, or by thepeculiarities of their formation rates in different epochs.</p>

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Studing the Evolution of Strongly Magnetized White Dwarfs. III. Frequency of Occurence Depending on Age

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • V. N. Aitov,
  • G. G. Valyavin

摘要

Abstract

The results of the latest study of the thermal evolution featuresof white dwarfs with large surface magnetic fields are presented.The main objective of the work is to test the hypothesis that forcooling degenerate stars—white dwarfs (WD)—the stopping ofexternal convection by a magnetic field greater than one megagausssignificantly slows down their cooling. For this purpose, theobserved luminosity function of WDs with surface fields greaterthan one megagauss is constructed in a volume with a 20 pc radius20 pc and compared to the known similar luminosity function of allWDs, regardless of their magnetic field values. The generaltendency—a significant increase in the frequency of occurrenceof magnetic white dwarfs (MWDs) with an increase in their absolutebolometric magnitude (a decrease in brightness) is confirmed.Empirical modeling of the effect of magnetically inducedsuppression of convection on the luminosity function of stronglymagnetized WDs also showed an increase in their frequency withage, although with a shift of one stellar magnitude toward weakermagnitudes. This shift is a consequence of the imperfection of themodel. The effect of an increase in the frequency of occurrence ofstrongly magnetized WDs with age cannot be explained either by asystematic difference in the masses of magnetic and non-magnetic(with magnetic fields below the detection limit) WDs, or by thepeculiarities of their formation rates in different epochs.