sdB星小质量伴星的视向速度测量
Radial Velocity Survey of Low-Mass Companions to sdB Stars
摘要：
亚矮星B（sdB）的起源尚未完全了解，因为它需要在红巨星阶段的高质量损失。密近双星系统中的sdB是通过共同的包层抛射形成的，但显然是单个sdB星的起源仍然不清楚。亚恒星伴星可能会触发共同的包层喷射，并帮助形成看似单一的sdB。使用高分辨率光谱的样本，我们的目标是检测小径向速度（RV）的变化所造成的这种低质量（子）恒星的同伴。RV使用尖锐的金属线进行高精度测量。我们的目标是测试的理论预测，并把人口的最低质量的同伴sdB星的限制。
英文摘要：
The origin of subdwarf B (sdB) stars is not fully understood yet since it requires high mass loss at the red giant stage. SdBs in close binary systems are formed via common envelope ejection, but the origin of apparently single sdB stars remains unclear. Substellar companions may be able to trigger common envelope ejection and help forming sdBs that appear to be single. Using a sample of high resolution spectra we aim at detecting small radial velocity (RV) shifts caused by such low mass (sub-)stellar companions. The RVs are measured with high accuracy using sharp metal lines. Our goal is to test the theoretical predictions and put constraints on the population of the lowest mass companions to sdB stars.
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