加州理工学院理论天体物理学家吉姆·富勒提出了一项新模型，表明即将死亡的类太阳恒星可能会因表面不均匀喷发物质而经历数千次微小推动1。在美国天文学会第248次会议于帕萨迪纳举行期间发表的这项研究指出，垂死恒星在数十万年内可能经历约10,000次小推动，单次推动仅有几米每秒的速度1。
这些看似微不足道的推动力会逐渐累积，最终使恒星获得约1公里每秒的速度1。富勒解释称，"每次发生时，恒星都会在相反方向获得一个小推动。就像牛顿说的，每一个作用都有一个相等的反作用。"1 这种积累的速度足以对双星系统产生重大影响。根据富勒的模型，"如果双星的轨道速度小于推动速度，疏散的双星将变得引力无界"1，这意味着这一机制可能导致恒星碰撞或破坏松散的双星系统。
Theoretical astrophysicist Jim Fuller from Caltech has developed a new model suggesting that dying Sun-like stars could accumulate thousands of small velocity kicks from uneven mass ejections at their surfaces, ultimately propelling them to speeds around one kilometer per second 1. Each individual ejection imparts only a few meters per second of momentum, but across approximately 10,000 such events occurring over hundreds of thousands of years, these incremental pushes compound significantly 1.
Fuller explained the underlying physics at the 248th meeting of the American Astronomical Society in Pasadena, noting that the process follows Newton's third law: "Each time this happens, the star gets a small kick in the opposite direction. It's like Newton said—every action has an equal and opposite reaction" 1. Such velocities are substantial enough to have dramatic consequences for binary star systems. According to Fuller, "if the orbital speed of a binary is less than the kick speed, a loosely bound binary will become gravitationally unbound" 1, potentially leading to the destruction of these systems or triggering stellar collisions.
评论
还没有评论，欢迎留下第一条。