We compared high-resolution spectra of Betelgeuse observed before and during the Great Dimming. Atomic lines are shallow and broad during the Great Dimming presumably because of molecular veiling and increased macroturbulence, ν _macro ≳ 23 km s⁻¹. The best fit for TiO bands was found for the MARCS model atmosphere with T _eff = 3500 K.

中文翻译：

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大调光期间槟榔宏观湍流增加的证据

我们比较了大调光之前和期间观察到的槟榔的高分辨率光谱。原子线是大调大概是因为分子光幕，提高宏观湍流，期间浅而宽的ν _宏观 ≳23公里S ^-1。对于二氧化钛的频带最适合被发现用于与榨渣模型气氛Ť _EFF  = 3500 K.