Spectroscopy is a powerful tool for detecting variability in the rapidly oscillating Ap (roAp) stars. The technique requires short integrations times and high resolution, and so is limited to only a few telescopes and instruments. To test the capabilities of the High Resolution Spectrograph (HRS) at the Southern African Large Telescope (SALT) for the study of pulsations in roAp stars, we collected 2.45 hr of high-resolution data of the well studied roAp star α Cir in a previously unused instrument configuration. We extracted radial velocity measurements using different rare earth elements, and the core of H _α , via the cross correlation method. We performed the same analysis with a set of α Cir data collected with the High Accuracy Radial velocity Planet Searcher spectrograph to provide a benchmark for our SALT HRS test. We measured significant radial velocity variations in the HRS data and show that our results are in excellent agreement between the two data sets, with similar signal-to-noise ratio detections of the principal pulsation mode. With the HRS data, we report the detection of a second mode, showing the instrument is capable of detecting multiple and low-amplitude signals in a short observing window. We concluded that SALT HRS is well-suited for characterizing pulsations in Ap stars, opening a new science window for the telescope. Although our analysis focused on roAp stars, the fundamental results are applicable to other areas of astrophysics where high temporal and spectral resolution observations are required.

光谱学是检测快速振荡 Ap (roAp) 恒星变异性的有力工具。该技术需要短积分时间和高分辨率，因此仅限于少数望远镜和仪器。为了测试南部非洲大望远镜 (SALT) 高分辨率光谱仪 (HRS) 研究 roAp 恒星脉动的能力，我们收集了 2.45 小时的高分辨率数据，该数据来自之前研究良好的 roAp 恒星α Cir。未使用的仪器配置。我们通过互相关法提取了使用不同稀土元素和 H _{α核心的径向速度测量值。}我们对一组α进行了相同的分析 使用高精度径向速度行星搜索器光谱仪收集的 Cir 数据为我们的 SALT HRS 测试提供基准。我们测量了 HRS 数据中显着的径向速度变化，并表明我们的结果在两个数据集之间非常一致，主要脉动模式的信噪比检测相似。通过 HRS 数据，我们报告了第二种模式的检测，表明该仪器能够在较短的观察窗口内检测到多个低幅度信号。我们得出结论，SALT HRS 非常适合表征 Ap 星的脉动，为望远镜打开了新的科学窗口。虽然我们的分析集中在 roAp 恒星上，但基本结果适用于其他需要高时间和光谱分辨率观测的天体物理学领域。