用尤利西斯削弱风:检查双稳定跳

Olivier Verhamme, J. Sundqvist
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引用次数: 1

摘要

辐射驱动的质量损失是大质量恒星演化的一个重要驱动力,但仍存在高度争议。目前的大质量恒星演化模型依赖于理论预测,即低光度大质量恒星在大约20,000 K的恒星有效温度以下会经历质量损失的突然增加。然而,新的辐射驱动的质量损失率预测显示没有这种双稳定性跳跃,这影响了大质量恒星的后主序演化。ULLYSES数据集提供了一个独特的机会来研究理论上的双稳定跳变二分法,并可能有助于评估大质量星风中双稳定跳变的存在。通过利用ULLYSES的紫外光谱和x -射手光学数据,我们获得了不再退化为风团效应的经验质量损失率约束,并得出了双稳定跳变温度范围内质量损失行为的新经验约束。目前的初步结果并没有显示双稳定性跳跃的明确存在。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Weakening the wind with ULLYSES: Examining the Bi-Stability Jump
Abstract Radiation-driven mass-loss is an important, but still highly debated, driver for the evolution of massive stars. Current massive star evolution models rely on the theoretical prediction that low luminosity massive stars experience a sudden increase in mass loss below a stellar effective temperature of about 20 000 K. However, novel radiation-driven mass-loss rate predictions show no such bi-stability jump, which effects the post main-sequence evolution of massive stars. The ULLYSES data set provides a unique opportunity to investigate the theoretical bi-stability jump dichotomy and may help to assess the existence of the bi-stability jump in massive star winds. By utilising UV spectra from ULLYSES combined with X-shooter optical data we obtain empirical mass-loss rate constraints, that are no longer degenerate to the effects of wind clumping, and derive novel empirical constraints on the mass-loss behavior across the temperature range of the bi-stability jump. Current preliminary results do not show a clear presence of a bi-stability jump.
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