论文标题
离心驱动的质量损失和大量恒星的爆发
Centrifugally Driven Mass Loss and Outbursts of Massive Stars
论文作者
论文摘要
旋转和质量损失是巨大恒星的至关重要的相互联系的特性，严重影响了它们的进化和最终命运。巨大的恒星在分手限制附近旋转的大量旋转降低了质量离心，从而形成了带有偶然性磁盘的星星，并可能驱动爆发。使用MESA恒星演化代码，我们检查了有效的角动量转运对大型恒星的主序列和后序列序列旋转演化的影响。在快速旋转器中，从收缩芯到扩展的包膜运输的角动量可以将表面层旋转超过破裂速率，尤其是对于主要序列末端（或以后）的恒星和低金属性环境中的恒星。我们还证明，迅速旋转的巨星可能会出现离心不稳定性，这可能会触发在发光蓝色可变恒星中观察到的S多拉德斯爆发。二元同伴的先前质量积聚增加了离心质量损失的可能性和强度。我们讨论对大规模恒星进化的含义，是恒星和发光的蓝色变量。
Rotation and mass loss are crucially interlinked properties of massive stars, strongly affecting their evolution and ultimate fate. Massive stars rotating near their breakup limit shed mass centrifugally, creating Be stars with circumstellar disks and possibly driving outbursts. Using the MESA stellar evolution code, we examine the effects of efficient angular momentum transport on the main sequence and post-main sequence rotational evolution of massive stars. In rapid rotators, angular momentum transported from the contracting core to the expanding envelope can spin up the surface layers past the breakup rate, particularly for stars near (or beyond) the end of the main sequence and in low-metallicity environments. We also demonstrate that centrifugal instabilities could arise in rapidly rotating massive stars, potentially triggering the S Doradus outbursts observed in luminous blue variable stars. Prior mass accretion from a binary companion increases both the likelihood and the intensity of centrifugal mass loss. We discuss implications for massive stellar evolution, Be stars, and luminous blue variables.
