利用线发射成像X射线探针解决大质量恒星物理学中的悬而未决问题
Addressing Outstanding Problems in the Physics of Massive Stars with the Line Emission Mapper X-ray Probe
AI总结：
本文论证LEM X射线探针凭借大有效面积和高能量分辨率，将在大质量恒星星风、碰撞激波及反馈研究中实现突破性观测。
摘要：
我们介绍了利用线发射成像（Line Emission Mapper，LEM）X射线探针对早型恒星进行高分辨率软X射线光谱观测的科学动机中的若干突出方面。LEM在热星物理学中的主要优势在于其巨大的有效面积，辅以其微量热计固有的能量分辨率，该分辨率可轻松达到1000的分辨本领，从而无需使用效率相对较低的色散光学元件。这种提升的灵敏度使得能够观测到比现有设施所能及的范围更暗、更远的大质量恒星，从而大大增加了潜在目标的数量。对于较亮的源，这种灵敏度开启了时域研究，能够在短时间内以较短的曝光时间获取足够的信号，从而在千秒（ks）量级的时间尺度上探测源的变异。我们认为，LEM的这些能力将在所有类型的热星系统中带来突破性进展，从理解单个OB型和沃尔夫-拉叶（WR）星风及其如何随金属丰度变化，到探测碰撞星风系统的激波以及磁性OB星的磁约束星风。LEM还将研究WR星气泡的能量学以及来自其强大的超新星前恒星风的反馈。
英文摘要：
We present some of the salient aspects of the scientific motivation for high resolution soft X-ray spectroscopy of early-type stars with the Line Emission Mapper X-ray Probe. The major strength of {\it LEM} for hot star physics is its large effective area, aided by the inherent energy resolution of its microcalorimeter that readily achieves resolving powers of 1000 and obviates the need for relatively inefficient dispersive optical elements. This increased sensitivity enables much fainter and more distant high mass stars to be observed than are accessible with present-day facilities, greatly increasing the pool of potential targets. For brighter sources, the sensitivity opens up time domain studies, wherein sufficient signal can be garnered in short order and exposure times, probing source variations on ks timescales. We argue that these capabilities of {\it LEM} will yield breakthroughs in all types of hot star systems, from understanding single OB and WR star winds and how they vary with metallicity, to probing the shocks of colliding wind systems and the magnetically channeled winds of magnetic OB stars. {\it LEM} will also study the energetics of WR star bubbles and feedback from their powerful pre-SN stellar winds.
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