论文标题
苔丝首先看进化的紧凑型脉动器：苔丝所见的南方黄半球已知的ZZ CETI星星
TESS first look at evolved compact pulsators: Known ZZ Ceti stars of the southern ecliptic hemisphere as seen by TESS
论文作者
论文摘要
语境。我们介绍了关于苔丝太空望远镜在120年代节奏模式下观察到的18个以前已知的ZZ CETI恒星的发现，在对南部黄道半球的调查观察期间。 目标。我们专注于对空间观测值的频率分析，将结果与先前基于地面的测量结果进行了比较。苔丝观察结果检测到的频率可以用作未来的星号分析的输入。 方法。我们对数据集进行了标准的预白，以得出不同目标的可能的脉动频率。在某些情况下，我们将Lorentzian拟合为频率群，这些频率群是在苔丝观测过程中发生的短期振幅/相变的结果。 结果。我们在120年代的节奏中通过苔丝观察到的七个ZZ CETI星中检测到40多个脉冲频率，其精度高于0.1 miCroHz精度。我们发现他0532-5605可能是新的爆发ZZ CETI。十个目标在其傅立叶变换中没有显示出任何明显的脉动频率，因为它们的固有微弱和/或大苔丝像素的拥挤的结合。在某些情况下，我们还检测到苔丝观测过程中可能的幅度/相变。以前没有从地面观测中确定这些目标中的这种行为。
Context. We present our findings on 18 formerly known ZZ Ceti stars observed by the TESS space telescope in 120s cadence mode during the survey observation of the southern ecliptic hemisphere. Aims. We focus on the frequency analysis of the space-based observations, comparing the results with the findings of the previous ground-based measurements. The frequencies detected by the TESS observations can serve as inputs for future asteroseismic analyses. Methods. We performed standard pre-whitening of the data sets to derive the possible pulsation frequencies of the different targets. In some cases, we fitted Lorentzians to the frequency groups that emerged as the results of short-term amplitude/phase variations that occurred during the TESS observations. Results. We detected more than 40 pulsation frequencies in seven ZZ Ceti stars observed in the 120s cadence by TESS, with better than 0.1 microHz precision. We found that HE 0532-5605 may be a new outbursting ZZ Ceti. Ten targets do not show any significant pulsation frequencies in their Fourier transforms, due to a combination of their intrinsic faintness and/or crowding on the large TESS pixels. We also detected possible amplitude/phase variations during the TESS observations in some cases. Such behaviour in these targets was not previously identified from ground-based observations.
