AI 中文总结
研究距离太阳1千秒差距内OB星的逃逸情况，通过拟合银河系旋转模型到恒星自行，用固定速度阈值等方法识别逃逸星，得出O型和B型星的逃逸比例，结果与先前研究一致，差异源于样本和方法不同。
AI 中文摘要
逃逸恒星是从诞生环境中被抛出的高速恒星，能为其所在星团的运动学历史提供见解。我们从最近发表的距离太阳1千秒差距内的OB星全样本中，得出40颗O型星和24487颗B型星的逃逸星概率。通过拟合银河系旋转模型到这些恒星的自行，用固定的二维特殊速度阈值23千米/秒及比较个体特殊速度与样本弥散来识别逃逸星。发现O型星逃逸比例为$17.5^{+0.1}_{-2.5}\%$，B型星为$6.9\pm0.1\%$，与先前研究一致，但差异主要源于识别逃逸星所用的OB星基础样本及选择方法的不同。
英文摘要
Runaway stars are high-velocity stars ejected from their birth environments that can provide insights into the kinematic history of the stellar cluster they were ejected from. We derived runaway star probabilities for 40 O-type stars and $24,487$ B-type stars taken from a recently published volume-complete sample of OB stars within 1 kpc of the Sun. We fit a Galactic rotation model to the observed proper motions of these stars and identify runaway stars using both a fixed 2D peculiar velocity threshold of $23\,km\,s^{-1}$ and by comparing individual peculiar velocities to the dispersion of the whole sample. We find runaway fractions of $17.5^{+0.1}_{-2.5}\%$ for O-type stars and $6.9\pm0.1\%$ for B-type stars; both using the fixed velocity threshold method. These values are consistent with previous studies, but with differences that are largely attributable to the underlying samples of OB stars used in various studies to identify runaway stars and to variations in the methods used to select them.
Comments13 pages, 8 figures
