恒星早期演化：星周盘对热改正的影响

恒星早期演化是恒星物理中极其重要却仍亟待完善的一环。影响早期演化的物理过程众多且复杂，尤以中心恒星与星周盘的相互作用最为重要，但传统恒星模型并未充分考虑此过程的影响。近年来的观测结果正挑战着当前模型的预测，其中分歧最突出的是模型预言的“颜色-星等”关系与年轻星团中早期恒星观测结果不一致。个中原因除对恒星内部演化认识不足外，还可能归因于模型未考虑星周盘对热改正效应的重要影响。因此，构建考虑星周盘的热改正模型，是理解恒星早期演化的迫切需求。本项目专注于研究热改正模型对“颜色-星等”关系的影响，探索构建更为准确的热改正模型，包括基于3D模拟计算的星周盘热改正模型。这些热改正模型将被运用到最新的恒星演化模型中，并用最新的高质量观测数据验证这些模型的可靠性。这些经验证后的模型将被用于研究大样本遥远恒星的物理性质，并将有助于对银河系结构和恒星形成等课题的研究。最后，这些结果将被开源以供所有用户使用。

The exploration of the early evolution of stars is extremely important for building a correct and complete stellar theory. However, since Hayashi's fully convective model of pre-mains sequence stars in the 1960s, limited progress has been made, due to the numerous complicated physical processes involved. Among these processes, the interplay between the central star and the circumstellar disk is essential, which is neglected in traditional stellar models. The prediction from these models is at odds with the observational results, which challenge the popular models. One major discrepancy is that the "color-magnitude" relationship predicted by the models is inconsistent with observations of the pre-main sequence stars in the young star cluster. On the one hand, it can be caused by the incompetence of the models in modeling the internal evolution of the stars, while on the other it may be attributed to the ignorance of the effect brought by the circumstellar disk on the bolometric correction. Therefore, a pre-main sequence stellar model taking into account the bolometric effect by the circumstellar disk is urgently needed.This project focuses on studying the influence of the bolometric correction model on the "color-magnitude" diagram. We will explore how to construct a more appropriate model of bolometric correction in the pre-main sequence stellar model, including the computation of bolometric correction based on 3D simulation of the circumstellar disk. The resulting model will be tested with high-quality observational data, such as that from Gaia and Gaia-ESO Survey. Both the bolometric correction and the stellar models with it will be publically released.