大质量O星风质量损失率-光度关系色散的起源
The origin of dispersion in the wind mass-loss rate--luminosity relation of massive O stars
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中文总结 AI 辅助
该研究通过定制风模型发现，大质量O星风质量损失率-光度关系的色散部分源于对有效温度、质量等参数的依赖，但仍有残余色散可能来自风变异性。
中文摘要 AI 辅助
热恒星的风由辐射力加速，该辐射力主要来自重元素的谱线跃迁。因此，预期风质量损失率主要随恒星光度变化。这一标度关系在O星及其风的观测分析中清晰显现，但存在显著色散。该色散的起源尚不清楚。热星风质量损失率与光度之间观测关系的部分色散可能源于质量损失率对除光度外的其他恒星参数（如有效温度、质量和金属丰度）的敏感性。我们利用我们的风模型检验了这种可能性。我们针对先前分析得出的大麦哲伦星云中选定单个O星的恒星参数，计算了定制风模型。为模拟风，我们使用了我们的全局风代码，该代码通过求解随动系中的辐射转移方程来计算辐射力。针对特定恒星参数计算的风模型比从模型网格导出的简单标度关系能更好地再现观测质量损失率。这表明质量损失率对除光度外的其他恒星参数的依赖可能解释了质量损失率-光度关系中的部分色散。然而，仍存在一些色散，这可能表明风变异性是色散的另一个来源。
英文摘要
Stellar winds of hot stars are accelerated by the radiative force that mainly comes from the line transitions of heavy elements. As a result, the wind mass-loss rate is expected to scale mostly with the stellar luminosity. This scaling clearly emerges from the observational analysis of O stars and their winds, but with substantial scatter. The origin of this scatter is unclear. Part of the scatter of the observational relation between the hot star wind mass-loss rate and luminosity may originate from the sensitivity of the mass-loss rate to other stellar parameters besides the luminosity, such as the effective temperature, mass, and metallicity. We tested this possibility using our wind models. We calculated tailored wind models for stellar parameters corresponding to selected individual O stars from the Large Magellanic Cloud as derived from a previous analysis. To model the wind, we used our global wind code that calculates the radiative force from the solution of the radiative transfer equation in the comoving frame. Wind models calculated for particular stellar parameters reproduce the observational mass-loss rates better than simple scaling relations derived from model grids. This indicates that the dependence of the mass-loss rate on the other stellar parameters except the luminosity might explain part of the dispersion in the relation between the mass-loss rate and luminosity. However, some dispersion still remains, which might indicate that wind variability is another source of the dispersion.
发表机构
- Masaryk University（马萨里克大学）
机构由 AI 辅助整理，请以论文原文为准。
