Circumstellar Matter: Neutral Shells and Planetary Nebula Formation

摘要：Huggins，帕特里克“星周物质：中性壳行星状星云的形成“AST-9986159该项目继续了PI对恒星演化阶段行星状星云中性包层的研究。 拟议的工作将包括几个新的研究领域：（1）喷流对行星状星云的塑造;（2）偶发性质量损失和化学变化;（3）喷出物中球状体和结的形成;以及（4）星周包层的演变。 这些结果将大大有助于提高我们对恒星演化最新阶段以及物质最终如何返回星际介质的理解。 开发的模型将广泛地与地面和空间多波长观测进行比较。该项目的资金由NSF恒星天文学天体物理学计划（AST/SAA）提供。

ABSTRACTHuggins, Patrick"Circumstellar Matter: Neutral Shells & Planetary Nebula Formation"AST-9986159This project continues the PI's study of neutral envelopes of the planetary nebula stage of stellar evolution. The proposed work will include several new areas of investigation: (1) the shaping of planetary nebulae by jets; (2) episodic mass loss and chemical changes; (3) globule and knot formation in the ejecta; and (4) circumstellar envelope evolution. The results will contribute substantially to improving our understanding of the latest stages of stellar evolution and how matter ultimately is returned to the interstellar medium. The models that are developed will be extensively compared to ground- and space-based multiwavelength observations.Funding for this project was provided by the NSF program for Stellar Astronomy & Astrophysics (AST/SAA).