Spectroscopic Imaging of Evolved Star Envelopes

演化恒星包层的光谱成像

• 批准号: 9115137
• 负责人: John Bieging
• 金额: $ 10.2万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-02-01 至 1995-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9115137&HistoricalAwards=false
• 关键词: Spectroscopic; Imaging; Evolved; Star; Envelopes

The recent construction of radio millimeter wavelengths has permitted the imaging of outflows from stars in advanced stages of stellar evolution in lines of various molecules. This accomplishment permits the kinematics of these outflows to be studied, leading to an understanding of how nonspherical planetary nebulae form, as well as the chemical interactions between gas and dust particles as a function of distance. The Principal Investigator (PI) will use the "BIMA" radio array at Hat Creek, California and the new Arizona-German millimeter-wave telescope on Mt. Graham to study these questions. These studies are expected to lead to a better understanding of why about one half the planetary nebulae around these stars are significantly nonspherical and to lead to a better understanding of the chemistry of interstellar grains. The latter question is of importance to the thermodynamic conditions of interstellar gas and ultimately to the condensation of new generations of stars.//

最近的无线电毫米波的建设， 允许对恒星在高级阶段的外流进行成像， 恒星演化的各种分子线。 这 成就允许这些流出的运动学被 研究，从而了解非球形行星 星云的形成，以及气体和 尘埃粒子是距离的函数。 校长 调查员（PI）将使用帽溪的“比马”无线电阵列， 加州和新的亚利桑那州-德国毫米波望远镜上 山格雷厄姆研究这些问题。 这些研究预计 让我们更好地理解为什么 这些恒星周围的行星状星云明显是非球形的 并让我们更好地理解 星际颗粒 最后一个问题对 星际气体的热力学条件，并最终 凝聚新一代的恒星。