Magnetic fields in white dwarfs and stellar evolution
Magnetic fields in white dwarfs and stellar evolution
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DOI：
10.1111/j.1365-2966.2004.08482.x
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发表时间：
2004-12
影响因子：
4.8
通讯作者：
C. Tout;D. Wickramasinghe;L. Ferrario
中科院分区：
文献类型：
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作者：
C. Tout;D. Wickramasinghe;L. Ferrario
在磁性Ap，Bp星（100-20000 G）和高磁场白色矮星（10 6 - 10 9 G）中观察到的表面磁场强度覆盖了几十年，但在这些恒星群中观察到的磁通量范围是相似的。因此，它们之间的进化联系似乎是合理的。对于这两组恒星，也有关于场复杂性的信息。磁白色矮星一般表现出非偶极场结构，如果我们假设高阶多极的贡献，可以最好地模拟。Ap星和Bp星的场结构类似复杂。我们调查的假设，即磁场的白色矮星可能是化石残留物的主序星阶段的问题，如何场的复杂性可能会出现，并保持在进化过程中的紧凑的星星状态。我们还解决的问题，在何种程度上看到的磁场在早期类型的恒星可能是化石残留物从前主序阶段的恒星演化可以追溯到时间的星星形成。
The surface magnetic field strengths observed in the magnetic Ap, Bp stars (100-20000 G) and in the high field magnetic white dwarfs (10 6 -10 9 G) cover many decades but nevertheless the range of magnetic fluxes observed in each of these stellar groups is similar. An evolutionary link between them therefore appears plausible. For both groups of stars there is also information on field complexity. The magnetic white dwarfs in general show non-dipole field structures which can be best modelled if we assume contributions from higher order multipoles. The field structures of the Ap and Bp stars are similarly complex. We investigate the hypothesis that the magnetic fields of the white dwarfs could be fossil remnants from the main-sequence phase by focussing on the problem of how field complexity may arise and be maintained during evolution to the compact star state. We also address the question of to what extent magnetic fields seen in the early type stars could be fossil remnants from the pre-main-sequence phases of stellar evolution dating back perhaps to the time of star formation.