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Some problems with slow rotation of CP stars

机译：CP星缓慢旋转的一些问题

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Some difficulties in explaining the slow rotation of CP stars are discussed. The most likely hypotheses are (1) a loss of angular momentum involving a magnetic field during "pre-main sequence" evolution and (2) the slow rotation existed from the very start of the creation of these stars. The braking hypothesis is supported by only one property of CP stars- the lower the mass of the star is, the greater the difference between its average rotation velocity vsini and that of normal stars. On the other hand, there is another property- the lower the rotation speeds of CP stars are, the greater their fraction among normal stars. The latter property supports the hypothesis that the lower the initial rotation speed of a star is when it is created, the greater the probability will become chemically peculiar. This property is inherent in chemically peculiar stars both with and without a magnetic field. It is proposed that the cause of the slow rotation of CP stars must be sought in the very earliest phases of their formation, as should the cause of the separation into chemically peculiar magnetic, chemically peculiar nonmagnetic, and normal stars.
机译：讨论了解释CP恒星缓慢旋转的一些困难。最可能的假设是（1）“主序前”演化过程中涉及磁场的角动量损失，以及（2）从这些恒星诞生之初就存在缓慢的自转。制动假设仅受CP恒星的一种属性支持-恒星质量越低，其平均旋转速度vsini与正常恒星之间的差异就越大。另一方面，还有一个特性-CP恒星的转速越低，它们在普通恒星中所占的比例就越大。后一种特性支持这样的假设，即恒星产生时的初始旋转速度越低，其化学特异的可能性就越大。这种特性在具有和没有磁场的化学特殊恒星中都是固有的。提议必须在CP恒星形成的最早阶段寻找其缓慢旋转的原因，也应将其分为化学特有的磁性，化学特有的非磁性和正常的恒星。

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