Searching for He-rich post-AGB stars in clos binaries systems

在 clo 双星系统中寻找富含 He 的后 AGB 恒星

• 批准号: 267375256
• 负责人: Dr. Thorsten Nagel
• 金额: --
• 依托单位: Abteilungen Astronomie und Hochenergieastrophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/267375256?language=en
• 关键词: Searching; He; rich; post; AGB

The origin of He-dominated post-AGB stars is still not understood. While very late thermal pulse scenarios can explain the C-dominated surface abundances, no single star evolutionary scenario is able to explain He-dominated post-AGB stars. The ejection of a common envelope in a previous evolutionary stage could explain how these stars have lost their hydrogen-rich envelope. With medium-resolution spectroscopy we aim to measure radial velocity shifts of promising close binary candidates. The detection of these systems would provide important information on the evolutionary origin of He-dominated post-AGB stars.

He主导的post-AGB星的起源仍然不清楚。虽然很晚的热脉冲的情况下，可以解释C为主的表面丰度，没有一个单一的星星演化的情况是能够解释He为主的post-AGB恒星。在先前的演化阶段中，一个共同的外壳的喷射可以解释这些恒星如何失去富含氢的外壳。利用中等分辨率的光谱学，我们的目标是测量有希望的近距离双星候选者的径向速度变化。这些系统的检测将提供重要的信息，He主导的post-AGB星的演化起源。