Nebular Hydrodynamical Evolution

星云流体动力学演化

• 批准号: 8913639
• 负责人: Bruce Balick
• 金额: $ 18.54万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-12-01 至 1994-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8913639&HistoricalAwards=false
• 关键词: Nebular; Hydrodynamical; Evolution

Planetary nebulae (PN) are gaseous shells of varying shapes surrounding compact, hot central stars. They are formed by intense stellar winds from luminous, highly evolved red giant stars. This process of mass ejection robs the stars of their outer hydrogen- rich envelopes, leaving behind compact stars consisting predominantly of helium and heavier elements. Upon ejection of their hydrogen-rich envelopes and the initial formation of the PN, high-speed winds from the central stars shape the nebulae and affect their kinematic and thermodynamic properties. The Principal Investigators (PIs) propose to continue with their current NSF-funded study of the spatial and kinematic nature of PN. They will construct a two-dimensional hydrodynamic computer code, supplemented with collisional and photon heating and radiative cooling algorithms. The PIs plan to apply this code to shocks and collisional processes in the evolution of PN and their halos, the history of stellar winds, and the origin of the peculiar knots and rims of very low ionization embedded in some PN. Detailed comparisons with observational data of PN will be made.

行星状星云（PN）是形状各异的气体壳层 围绕着致密炽热的中心恒星 它们是由强烈的 来自发光的、高度进化的红巨星的恒星风 这 物质抛射的过程夺走了恒星外层的氢 丰富的信封，留下紧凑的恒星， 主要由氦和重元素组成 在弹射时， 它们的富氢外壳和PN的初始形成， 来自中央恒星的高速风塑造了星云， 影响它们的运动学和热力学性质。 主要研究者（PI）建议继续开展 目前NSF资助的空间和运动学性质的研究， PN。 他们将建造一台二维流体动力学计算机 代码，补充了碰撞和光子加热， 辐射冷却算法PI计划将此代码应用于 PN演化中的冲击和碰撞过程及其 晕，恒星风的历史，和奇特的起源 结和边缘的非常低的电离嵌入一些PN。 将与PN的观测数据进行详细比较。