新的恒星模型--是福是祸？
New Stellar Models - Boon or Bane?
摘要：
讨论了新的自转恒星演化模型对星族合成模型预测的影响。大质量旋转恒星比非旋转恒星有更大的对流核心，并且由于混合增加，它们的外层化学物质丰富。这两种效应共同导致恒星变得更热、更亮，特别是在后来的进化阶段。因此，包含大质量恒星的恒星星族被预测在给定质量下会变得更亮，并发射出更多的电离光子。根据假设的自转速度，自转会引起年轻恒星星族性质的深刻变化。这些变化是最明显的，在后来的演变阶段，并在较短的波长的光谱能量分布。最引人注目的是，O型和沃尔夫-拉叶星的莱曼连续体光度增加了五倍。在将这些模型与观测结果进行比较时需要小心，在尝试重新校准恒星形成指标之前，仍然需要对模型进行一些微调。
英文摘要：
The impact of new stellar evolution models with rotation on the predictions of population synthesis models is discussed. Massive rotating stars have larger convective cores than their non-rotating counterparts, and their outer layers are chemically enriched due to increased mixing. Together, these two effects lead to hotter and more luminous stars, in particular during later evolutionary phases. As a result, stellar populations containing massive stars are predicted to become more luminous for a given mass and to emit more ionizing photons. Depending on the assumed rotation velocity, rotation causes profound changes in the properties of young stellar populations. These changes are most noticeable at later evolutionary phases and at shorter wavelengths of the spectral energy distribution. Most strikingly, the Lyman continuum luminosity increases by up to a factor of five in O- and Wolf-Rayet stars. Care is required when comparing these models to observations, and some fine-tuning of the models is still required before recalibrations of star-formation indicators should be attempted.
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