The nature of B supergiants: clues from a steep drop in rotation rates at 22 000 K
The nature of B supergiants: clues from a steep drop in rotation rates at 22 000 K
复制标题
B超巨星的本质：22000K时自转速率急剧下降的线索
DOI：
10.1051/0004-6361/201014205
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发表时间：
2010
影响因子：
6.5
通讯作者：
D. Lennon
中科院分区：
文献类型：
--
作者：
J. Vink;I. Brott;G. Gräfener;N. Langer;A. D. Koter;A. D. Koter;D. Lennon
B超巨星在HRD图中的位置是大质量星星演化中一个长期存在的问题。在这里，我们建议他们的性质可能会揭示利用其旋转特性，我们强调了大质量星星旋转速率在22 000 K的有效温度急剧下降。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“双稳定制动”，并讨论了它对大质量恒星演化的潜在影响。
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 22 000 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 braking” and discuss its potential consequences for the evolution of massive stars.