Spectroscopic Investigations of Massive Binaries

大型双星的光谱研究

• 批准号: 0205297
• 负责人: Douglas Gies
• 金额: $ 25.74万
• 依托单位: Georgia State University Research Foundation, Inc.
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-08-01 至 2006-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0205297&HistoricalAwards=false
• 关键词: Spectroscopic; Investigations; Massive; Binaries

AST-0205297PI GiesThe majority of the most massive stars are born in close pairs that are destined to interact over their lifetime. The influence of a companion can dramatically alter the evolutionary paths of the stars: the mass donors can be stripped down to a fraction of their original size while the mass gainers can become rejuvenated as more massive and luminous stars. These altered stars will eventually explode as peculiar supernovae, and their remnants dominate the appearance of the high energy universe (as massive X-ray binaries containing neutron stars and black holes). Although the starting and end-points of binary evolution are understood the processes that forge the intermediate stages are still mysterious, and great uncertainties surround the issues of mass and angular momentum transfer and loss. This project will be an investigation of these processes at various stages in the evolutionary drama through spectroscopic studies of a number of key systems. The first part is a survey of two dozen targets for new binaries with hard to detect companions. The second section is an orbital analysis of the H a emission flux formed in the circumstellar gas in two currently interacting systems. The third part examines the link between mass transfer and the spin up of rapidly rotating stars, and includes a hunt for faint post-mass transfer companions of Be stars. The final component is a joint H a -X-ray study of mass transfer in massive X-ray binaries as documented in extensive H a spectroscopy obtained with the KPNO Coude Feed Telescope.***

大多数质量最大的恒星都是成双成对地诞生的，它们注定要在一生中相互作用。伴星的影响可以戏剧性地改变恒星的进化路径：质量捐赠者可以被剥离到原来大小的一小部分，而质量获得者可以变得更年轻，成为更大质量和更明亮的恒星。这些变化的恒星最终将以特殊的超新星的形式爆炸，它们的残骸主导着高能宇宙的出现(作为包含中子星和黑洞的大质量X射线双星)。尽管双星演化的起点和终点已被理解，但形成中间阶段的过程仍然神秘，围绕着质量和角动量转移和损失的问题也存在极大的不确定性。这个项目将通过对一些关键系统的光谱研究来研究进化戏剧中不同阶段的这些过程。第一部分是对24个新双星目标的调查，这些目标很难检测到同伴。第二部分是对目前两个相互作用系统中的星周气体中形成的Ha发射通量的轨道分析。第三部分研究了质量转移和快速旋转恒星的自转之间的联系，包括寻找微弱的Be恒星在质量转移后的伴星。最后一个组成部分是用KPNO Coude Feed望远镜获得的广泛的H a光谱学记录的大质量X射线双星中的质量传递的联合H a-X射线研究。