Protoneutron star dynamos: pulsars, magnetars, and radio-silent X-ray emitting neutron stars
Protoneutron star dynamos: pulsars, magnetars, and radio-silent X-ray emitting neutron stars
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原中子星发电机：脉冲星、磁星和射电静默 X 射线发射中子星
DOI：
10.1051/0004-6361:20054473
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
G.Belvedere
中科院分区：
文献类型：
--
作者：
A.Bonanno;V.Urpin;G.Belvedere
.我们讨论的平均场发电机行动的质子中子星，受到不稳定性在早期演化阶段。平均场产生于中子-芬格不稳定区，在那里Rossby数是1.1，平均场发电机是有效的。根据旋转速率的不同，平均场发电机可以导致三种不同类型的恒星的形成。如果质子中子星星的初始周期很短，则产生的大尺度场很强（> 3 × 10 13 G），超过了中子星星表面的小尺度场。如果旋转是中等的，那么这些恒星或多或少会形成标准的偶极场（< 3 × 10 13 G），但表面的小尺度磁场比偶极场强。如果自转非常慢，那么平均场发电机就不工作，中子星星就没有全局场。尽管如此，在这样的恒星中会产生强的小尺度场，它们可以表现为具有非常低的自旋下降速率的物体，但具有从光谱特征推断的强磁场。
. We discuss the mean-field dynamo action in protoneutron stars that are subject to instabilities during the early evolutionary phase. The mean field is generated in the neutron-finger unstable region where the Rossby number is ∼ 1 and mean-field dynamo is efficient. Depending on the rotation rate, the mean-field dynamo can lead to the formation of three different types of pulsars. If the initial period of the protoneutron star is short, then the generated large-scale field is very strong ( > 3 × 10 13 G) and exceeds the small-scale field at the neutron star surface. If rotation is moderate, then the pulsars are formed with more or less standard dipole fields ( < 3 × 10 13 G) but with surface small-scale magnetic fields stronger than the dipole field. If rotation is very slow, then the mean-field dynamo does not operate, and the neutron star has no global field. Nevertheless, strong small-scale fields are generated in such pulsars, and they can manifest themselves as objects with very low spin-down rate but with a strong magnetic field inferred from the spectral features.