Numerical Simulation of Nebulae with Implications for Galactic Chemical Evolution

9319034费兰发射线区域定义了恒星演化的终点，并存在于宇宙中最明亮的物体(遥远的类星体)中。对这种气体的详细理解需要参考大规模的数值模拟。该项目将继续开发一种计算机程序，模拟非平衡等离子体中的物理条件并预测其光谱。我们将研究活动星系核、H II区和经典新星中的几个广泛问题。高红移类星体的发射线云具有接近太阳10倍的金属度，类似于在类似历元的大质量星系核心中发现的，并且这种金属度与光度和/或红移相关。这项工作将探测大红移星系的化学演化。第二个要调查的区域将包括试图了解星系H II区和周围光解离区的物理条件。这将导致对银河系丰度梯度测量的更全面的理解。另一个领域将是经典新星，以更好地限制抛射物的质量和丰度，从而限制它们对星系核合成的贡献。******

9319034 Ferland Emission line regions define the end points of stellar evolution and are present in the most luminous objects in the universe (the distant quasars). Detailed understanding of this gas requires reference to large- scale numerical simulations. This project will continue developing a computer program which simulates the physical conditions within a non-equilibrium plasma and predicts its spectrum. Several broad problems in active galactic nuclei, H II regions, and classical novae will be investigated . The emission line clouds of high redshift quasars have metallicities approaching 10 times solar, similar to those found in the cores of massive galaxies at similar epochs, and this metallicity correlates with luminosity and/or redshift. This work will probe galactic chemical evolution at large redshift. A second area to be investigated will involve an attempt to understand physical conditions within galactic H II regions and surrounding photodissociation regions. This will lead to a more complete understanding of measurements of galactic abundance gradients. Another area will be classical novae, to better constrain the mass and abundances of the ejecta, and thereby their contribution to galactic nucleosynthesis. ******