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II型X射线爆发<br />
久现源<br />
爆发的强度要比I型X射线爆发强一个量级或更强,<br />
它会出现在<strong>Be</strong>/X射线双星的任何轨道位相,取决于<br />
<strong>Be</strong>星的活动性,<strong>Be</strong>星气壳的突然膨胀或质量损失<br />
突然增强会引起II型X射线爆发。<br />
X Per, 这类<strong>Be</strong>/X射线双星一般具有较长的轨道周<br />
期(大于100天)和致密星自旋周期(大于200秒)。
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