Is there evidence for field restructuring or decay in accreting magnetic white dwarfs?
文献类型：期刊论文
| 作者 | Zhang, C. M.1; Wickramasinghe, D. T.2; Ferrario, Lilia2 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2009-08-21 |
| 卷号 | 397期号:4页码:2208-2215 |
| 关键词 | binaries: close stars: dwarf novae stars: magnetic fields novae, cataclysmic variables white dwarfs |
| 英文摘要 | The evolution of the magnetic field of an accreting magnetic white dwarf with an initially dipolar field at the surface has been studied for non-spherical accretion under simplifying assumptions. Accretion on to the polar regions tends to advect the field toward the stellar equator which is then buried. This tendency is countered by Ohmic diffusion and magnetohydrodynamic instabilities. It is argued that if matter is accreted at a rate of (M)over dot(crit) similar to 10(16) g s(-1) and the total mass accreted exceeds a critical value Delta(M)over dot(crit) similar to 0.1-0.2 M(circle dot), the field may be expected to be restructured, and the polar field to be reduced reaching a minimum value of similar to 10(3) G (the 'bottom field') independently of the initial field strength. Below this critical accretion rate, the field diffuses faster than it can be advected, and accretion has little effect on field strength and structure. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000268958400045 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7624]  |
| 专题 | 国家天文台_射电天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Australian Natl Univ, Inst Math Sci, Canberra, ACT 0200, Australia |
| 推荐引用方式 GB/T 7714 | Zhang, C. M.,Wickramasinghe, D. T.,Ferrario, Lilia. Is there evidence for field restructuring or decay in accreting magnetic white dwarfs?[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2009,397(4):2208-2215. |
| APA | Zhang, C. M.,Wickramasinghe, D. T.,&Ferrario, Lilia.(2009).Is there evidence for field restructuring or decay in accreting magnetic white dwarfs?.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,397(4),2208-2215. |
| MLA | Zhang, C. M.,et al."Is there evidence for field restructuring or decay in accreting magnetic white dwarfs?".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 397.4(2009):2208-2215. |
入库方式： OAI收割
来源：国家天文台
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