Theoretical Investigations of the Equation of State for Stellar Interiors

AST-9987391 Dappen，Werner PI提出了一个统一的恒星内部计算状态方程。 这些模型是恒星天文学的基础，它们为理解正常恒星的结构以及恒星演化后期的模型提供了基础。 该项目的主要目标是调和目前存在于确定太阳内部结构的两种相互竞争的方法之间的不一致性。 PI将使用其内部模型与GONG太阳振荡数据之间的直接比较。 这应该提供可靠的测试，至少在低密度区域的状态方程。 这些结果可能有助于改善太阳氦丰度的测定，这个值对一般恒星模型和氦的宇宙起源有重大影响。 它们也有潜力改进其他恒星演化阶段的模型计算，例如低密度巨星到高密度白色矮星。该项目的资金由美国国家科学基金会恒星天文天体物理学计划（AST/SAA）提供。*

AST-9987391Dappen, WernerThe PI proposes to develop a unified equation of state for stellar interior computations. Such models are the foundation of stellar astronomy, and they provide the basis for understanding the structure of normal stars, as well as models for later stages of stellar evolution. The main goal of the project is to reconcile inconsistencies that currently exist between two competing approaches to determining the interior structure of the Sun. The PIs will use direct comparisons between the their interior models and GONG solar oscillation data. This should provide firm tests of the derived the equation of state, at least in low density regions. The results may help improve the determination of the Sun's helium abundance, a value that has substantial impact on stellar models in general and on the cosmological origins of helium. They also have the potential to improve model calculations for other stellar evolutionary stages, such as low density giant stars to high density white dwarf stars.Funding for this project was provided by the NSF program for Stellar Astronomy & Astrophysics (AST/SAA).***