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arXiv 2007.12779astro-ph.SRastro-ph.IM
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旋转恒星的合成光谱

Synthetic Spectra of Rotating Stars

Mikhail Lipatov, Timothy D. Brandt

摘要:

许多早期型恒星有扁球形的表面,空间温度的变化,以及谱线变宽,这表明它们有很大的自转速度。旋转应该对这类恒星的全光谱有重大影响。为了从光谱中推断结构和生命史参数,必须在相应恒星模型的二维表面上积分比强度。为此,我们提供了PARS(Paint the Atmosphere of Rotating Stars)--一种基于模型的集成方案,该模型结合了固体旋转、罗氏质量分布以及重力和能量通量的共线性(https://github.com/mlipatov/paint_atmospheres)。该方案的特点是方位积分的封闭形式的表达,高阶数值近似的纵向积分,和精确计算的表面有效温度的旋转速率高达99.9%的开普勒极限。该方案的扩展包括合成色星等图和行星凌日曲线。

英文摘要:

Many early-type stars have oblate surfaces, spatial temperature variations, and spectral line broadening that indicate large rotational velocities. Rotation ought to have a significant effect on the full spectra of such stars. To infer structural and life history parameters from their spectra, one must integrate specific intensity over the two-dimensional surfaces of corresponding stellar models. Toward this end, we offer PARS (Paint the Atmospheres of Rotating Stars) -- an integration scheme based on models that incorporate solid body rotation, Roche mass distribution, and collinearity of gravity and energy flux (https://github.com/mlipatov/paint_atmospheres). The scheme features a closed-form expression for the azimuthal integral, a high-order numerical approximation of the longitudinal integral, and a precise calculation of surface effective temperature at rotation rates up to 99.9% of Keplerian limit. Extensions of the scheme include synthetic color-magnitude diagrams and planetary transit curves.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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