An original method of estimating the projected rotational velocity, vsini, and the macroturbulent velocity, v_mac, of evolved M giant stars is presented. It is based on the use of spectrum synthesis and multiline analysis tools. The goal is to fit the mean line profile of observations with that of synthetic spectra. The method is applied to the red giant star RZ Ari, and the results vsini = 6.0 ± 0.5 km s⁻¹ and v_mac = 2.0 ± 1.0 km s⁻¹ are obtained.

中文翻译：

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确定冷磁巨星的旋转和宏观湍流速度

提出了一种原始方法，用于估算已演化的M颗巨星的预计旋转速度v sin i和大湍流速度v _mac。它基于频谱合成和多线分析工具的使用。目的是使观测值的平均线轮廓与合成光谱的轮廓线相吻合。将该方法应用于红色巨星RZ Ari，并获得结果v sin i  = 6.0±0.5 km s ^-1和v _mac  = 2.0±1.0 km s ^-1。