标题： 近红外红超巨星特征的演化综合建模 显示英文标题

标题： Evolutionary synthesis modeling of red supergiant features in the near-infrared

摘要： 我们提出了用于分析年轻麦哲伦云星团和星暴星系光谱中观测到的近红外光谱特征的演化综合模型。研究了在2.29微米（2-0带头）和1.62微米（6-3带头）处第一和第二泛音以及（U-B）、（B-V）和（J-K）颜色的时间演化。我们发现，具有亚太阳化学成分的大质量恒星在红超巨星阶段的当前演化轨迹对于红外恒星特征时间演化的任何综合来说都是不可靠的。所选红外特征对冷星大气参数的高度敏感性使我们能够限制大质量恒星在其核心氦燃烧阶段赫罗图红区部分所花费的时间和温度。通过调整红超巨星参数以重现观测模板的性质，我们得出了一组经验校准的光谱辐射模型。 显示英文摘要

摘要： We present evolutionary synthesis models applied to near--infrared spectral features observed in the spectra of young Magellanic Cloud clusters and starburst galaxies. The temporal evolution of the first and second overtones of CO at 2.29 micron (2-0 bandhead) and 1.62 micron (6-3 bandhead) and of the (U-B), (B-V) and (J-K) colors are investigated. We find that the current evolutionary tracks of massive stars with sub-solar chemical composition in the red supergiant phase are not reliable for any synthesis of the temporal evolution of infrared stellar features. The high sensitivity of the selected infrared features to the atmospheric parameters of cool stars allows us to place constraints on the temperature and the fraction of time spent in the red part of the Hertzsprung-Russell diagram by massive stars during their core-helium burning phase. We derive a set of empirically calibrated spectrophotometric models by adjusting the red supergiant parameters such that the properties of the observed templates are reproduced.