Time resolved spectroscopy of luminous sdOs - searching for their massive compact companions

发光 sdO 的时间分辨光谱 - 寻找它们的巨大致密伴星

• 批准号: 229821280
• 负责人: Professor Dr. Stephan Geier
• 金额: --
• 依托单位: Institut für Physik und Astronomie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/229821280?language=en
• 关键词: Time; resolved; spectroscopy; luminous; sdOs

Luminous hot subdwarf stars of spectral type O are the remnants of main sequence stars that lost most of their hydrogen envelopes. The formation of these stars is unclear. Recently, two of the brighest sdOs have been discovered to be X-ray binaries with massive compact companion like white dwarfs or neutron stars. Although this kind of sdO stars is known for decades, no systematic search for close companions has been conducted. We were granted seven nights at McDonald observatory to take high resolution, time resolved spectroscopy of 8 bright sdOs with the SES spectrograph mounted at the 2.1m telescope. Our goal is to measure radial velocity shifts caused by unseen, close companions and derive the orbital solutions of such binaries. The nature of the unseen companions can be constrained in this way.

光谱O型的发光热颗粒恒星是失去大部分氢化膜的主要序列恒星的残留物。这些恒星的形成尚不清楚。最近，已经发现两个最初的SDO是X射线二进制文件，具有大量的紧凑型伴侣，例如白矮人或中子星。尽管这种SDO明星几十年来一直闻名，但没有系统地寻找亲密的伴侣。我们在麦当劳天文台获得了七个晚上，以进行高分辨率，时间分辨出8个明亮的SDO的时间光谱，而SES光谱仪安装在210万望远镜上。我们的目标是测量由看不见的，亲密的伴侣和得出此类二进制方法的轨道溶液引起的径向速度转移。看不见的同伴的性质可以通过这种方式受到约束。