论文标题
重新访问明亮的三角洲scuti恒星及其与苔丝和Gaia DR3的周期性劳动关系
Revisiting bright delta Scuti stars and their period-luminosity relation with TESS and Gaia DR3
论文作者
论文摘要
我们已经使用NASA的TESS任务来研究分类的Delta Scuti明星。我们检查了434颗恒星的苔丝光曲线，其中包括以前几乎没有观察到的许多恒星。我们发现62个不是Delta Scuti脉动器，而大多数则显示出二进制的变异性。对于372颗Delta Scuti恒星，我们提供了主要脉动模式的时期和振幅的目录。使用GAIA DR3视差，我们将恒星放在周期露光图中，并确认先前的发现大多数恒星位于脊上，与基本径向模式下的脉动相对应，并且许多其他恒星落在第二个山脊上，这在时期较短。得益于修订的时期和距离，第二个山脊比以前更清晰。我们证明了周期亮度图在区分三角洲Scuti星和短期RR Lyre恒星中的值，我们发现了几个新的高频三角洲Scuti星星的新示例，这些恒星具有常规的销售模式序列，包括XX Pyx和29 Cyg。最后，我们重新审视开普勒观察到的三角洲scuti星的样品，并证明它们遵循紧密的周期密度关系，搏动常数对于q = 0.0315 d的基本模式。
We have used NASA's TESS mission to study catalogued delta Scuti stars. We examined TESS light curves for 434 stars, including many for which few previous observations exist. We found that 62 are not delta Scuti pulsators, with most instead showing variability from binarity. For the 372 delta Scuti stars, we provide a catalogue of the period and amplitude of the dominant pulsation mode. Using Gaia DR3 parallaxes, we place the stars in the period-luminosity diagram and confirm previous findings that most stars lie on a ridge that corresponds to pulsation in the fundamental radial mode, and that many others fall on a second ridge that is a factor two shorter in period. This second ridge is seen more clearly than before, thanks to the revised periods and distances. We demonstrate the value of the period-luminosity diagram in distinguishing delta Scuti stars from short-period RR Lyrae stars, and we find several new examples of high-frequency delta Scuti stars with regular sequences of overtone modes, including XX Pyx and 29 Cyg. Finally, we revisit the sample of delta Scuti stars observed by Kepler and show that they follow a tight period-density relation, with a pulsation constant for the fundamental mode of Q = 0.0315 d.
