The Evolution of Planetary Nebulae and Their Central Stars

行星状星云及其中心恒星的演化

• 批准号: 9115030
• 负责人: James Kaler
• 金额: $ 20万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-03-15 至 1996-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9115030&HistoricalAwards=false
• 关键词: Evolution; Planetary; Nebulae; Their; Central

The expulsion of their envelopes by red supergiants is a crucial moment in an intermediate-mass star's history. The expelled envelope glows from the light of the hot remant core of the star and is called a "planetary nebula." The remnant eventually cools to become a white dwarf star enriched in intermediate elements such as C,N,O,Ne. In this three-year renewal award, the Principal Investigator (PI) will study both the structure of the nebulae from recent images in the light of various molecules and the evolutionary paths of the proto- white dwarfs defined by different masses and chemical abundances of the initial star. It is expected that this group will add to their already substantial contributions to our understanding of this critical juncture in stellar evolution.

红超巨星驱逐它们的包层是中等质量恒星历史上的一个关键时刻。被排出的包层在恒星炽热残余核心的光芒下发光，被称为“行星状星云”。残余物最终冷却成为一颗富含 C、N、O、Ne 等中间元素的白矮星。 在这个为期三年的更新奖项中，首席研究员（PI）将根据各种分子研究最近图像中的星云结构，以及由初始恒星的不同质量和化学丰度定义的原白矮星的演化路径。 预计该小组将为我们对恒星演化这一关键时刻的理解做出更大的贡献。