Numerical Simulation of Nebulae with Implications for Galactic Chemical Evolution

发射线区域定义了恒星演化的终点，并且存在于宇宙中最明亮的物体（遥远的类星体）中。要详细了解这种气体需要参考大规模数值模拟。该项目将继续开发一个计算机程序来模拟非平衡等离子体的物理条件并预测其光谱。几个广泛的问题，在活动星系核，H区，和经典新星将被研究。高红移类星体的发射线云的金属丰度接近太阳的10倍，类似于在类似时代的大质量星系核心中发现的金属丰度，这种金属丰度与光度和/或红移有关。这项工作将探测大红移下的星系化学演化。第二个要研究的领域将涉及试图了解银河系H II区域和周围光解区域的物理条件。这将使我们对星系丰度梯度的测量有更全面的了解。另一个区域将是经典新星，以更好地限制喷出物的质量和丰度，从而对星系核合成做出贡献。* * * * * *

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. ******