The HI 21-cm Line as a Probe of Stellar Mass Loss and Evolution

HI 21 厘米线作为恒星质量损失和演化的探测器

• 批准号: 1310930
• 负责人: Lynn Matthews
• 金额: $ 18.51万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2017-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1310930&HistoricalAwards=false
• 关键词: HI; 21; cm; Line; Probe

This is an observational project to map out the 21-cm emission line of atomic hydrogen in the circumstellar envelopes of nearby Asymptotic Giant Branch (AGB) and Cepheid variable stars in order to better understand stellar mass loss and late stages of stellar evolution. The PI will use data from the Very Large Array (VLA) to provide better estimates of the total mass, extent and chemistry of circumstellar envelopes, new insights into the duration and geometry of mass-loss during the late stages of stellar evolution and new constraints on the occurrence of mass loss on the Cepheid instability strip, as well as better understanding of how evolved stars interact with the surrounding interstellar medium. Broader impacts include training undergraduate students through the Research Experiences for Undergraduates program, producing an educational podcast on so-called radio stars, making data and data products publicly available, and incorporating research into public lectures.

这是一个观测项目，旨在绘制附近的渐近巨星分支（AGB）和造父变星的星周包膜中原子氢的21厘米发射线，以便更好地了解恒星质量损失和恒星演化的后期阶段。PI将使用来自甚大阵列（VLA）的数据来更好地估计星周包层的总质量、范围和化学成分，对恒星演化后期质量损失的持续时间和几何形状有新的见解，对造父变星不稳定带上质量损失的发生有新的限制，以及更好地理解演化恒星如何与周围星际介质相互作用。更广泛的影响包括通过本科生研究经验项目培训本科生，制作关于所谓广播明星的教育播客，公开数据和数据产品，以及将研究纳入公共讲座。