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: 8813686
• 负责人: James Kaler
• 金额: $ 22.85万
• 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: 1988
• 资助国家: 美国
• 起止时间: 1988-12-15 至 1992-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8813686&HistoricalAwards=false
• 关键词: Evolution; Planetary; Nebulae; Their; Central

During their late stages of evolution, stars of roughly 1 solar mass eject their outer, hydrogen-rich envelopes and thereby produce so-called planetary nebulae (i.e., expanding gaseous shells that, despite the nomenclature, have nothing to do with planets). The remaining stellar cores (i.e., the central stars of the planetary nebulae) consist predominantly of helium, though heavier elements may be present as well. The Principal Investigator proposes to study the formation of planetary nebulae and the evolution of their central stars, with particular attention paid to determining the elemental abundances present in the precursor stars, the nebulae, and the central stars of planetary nebulae. The work will include the compiling of a "Catalogue of Spectrum Line Intensities" of planetary nebulae.

在演化的后期阶段，质量大约为太阳1倍的恒星会喷出其外层富氢的外壳，从而产生所谓的行星状星云（即膨胀的气体外壳，尽管有这样的命名，但与行星无关）。其余的恒星核心（即行星状星云的中心恒星）主要由氦组成，尽管也可能存在较重的元素。首席研究员建议研究行星状星云的形成及其中心恒星的演化，特别注意确定行星状星云的前体恒星、星云和中心恒星中存在的元素丰度。这项工作将包括编制行星状星云的“谱线强度目录”。