B超巨星的性质：来自22000 K旋转速率急剧下降的线索。双稳定制动的可能性
The nature of B supergiants: clues from a steep drop in rotation rates at 22000 K. The possibility of Bi-stability braking
摘要：
B超巨星在赫罗图（HRD）中的位置是大质量恒星演化中一个长期存在的问题。在这里，我们提出可以利用它们的旋转特性来揭示它们的本质，并且我们强调了在22000 K的有效温度下大质量恒星旋转速率的急剧下降。我们讨论了两种可能的解释：一方面，这一特征可能是由于主层序的结束，这可能潜在地限制了岩心过冲参数。另一方面，该特征可能是在预测的双稳跃变位置处增强的质量损失的结果。我们把这种效应称为“双稳定性破坏”，并讨论了它对大质量恒星演化的潜在影响。
英文摘要：
The location of B supergiants in the Hertzsprung-Russell diagram (HRD) represents a long-standing problem in massive star evolution. Here we propose their nature may be revealed utilising their rotational properties, and we highlight a steep drop in massive star rotation rates at an effective temperature of 22000 K. We discuss two potential explanations for it. On the one hand, the feature might be due to the end of the main sequence, which could potentially constrain the core overshooting parameter. On the other hand, the feature might be the result of enhanced mass loss at the predicted location of the bi-stability jump. We term this effect "bi-stability breaking" and discuss its potential consequences for the evolution of massive stars.
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