关于Octans星协三元系TYC9300-0891-1AB/TYC9300-0529-1的转动周期
On the rotation periods of the components of the triple system TYC9300-0891-1AB/TYC9300-0529-1 in the Octans Association
摘要：
恒星自转取决于不同的参数。这些参数的值范围导致年轻星团/星协中观察到的旋转周期分布的分散。我们的研究重点是不同的星周环境对恒星自转的影响。更具体地说，我们正在寻找在恒星协会的视觉三重系统，所有的恒星参数是相似的，唯一的例外是未知的初始旋转周期，和拱星环境，在这个意义上说，两个约相等质量的组件之一，有一个接近的第三个“扰动”组件。在本研究中，我们分析了3500万年前的视觉三元系统TYC 9300 - 0891 - 1AB + TYC 9300 - 0529 - 1在年轻的Octans恒星协会组成的三个等质量的K0V组件。我们从文献中收集了所有信息，使我们能够推断出这三个组成部分实际上是物理上结合在一起的，形成了一个三重系统，并且是Octans协会的成员。我们收集了两个观测季节的宽波段光度时间序列。我们发现，所有的组件是可变的，磁活性，并从周期图分析，我们发现，未解决的组件TYC 9300 - 0891 - 1AB的旋转周期P = 1.383 d和TYC 9300 - 0529 - 1的旋转周期P = 1.634 d。TYC 9300 - 0891 - 1A、TYC 9300 - 0891 - 1B和TYC 9300 - 0529 - 1具有相同的质量、年龄和初始化学成分。我们测量到的相对较小的16%的旋转周期差异表明，所有的组件都有类似的初始旋转周期和盘寿命，并且组件A和“扰动”组件B（反之亦然）之间的157 AU的间隔已经足够大，以防止任何显着的扰动/缩短吸积盘寿命。
英文摘要：
Stellar rotation depends on different parameters. The range of values of these parameters causes the dispersion in the rotation period distributions observed in young stellar clusters/associations. We focus our investigation on the effects of different circumstellar environments on stellar rotation. More specifically, we are searching in stellar Associations for visual triple systems where all stellar parameters are similar, with the only exceptions of the unknown initial rotation period, and of the circum-stellar environment, in the sense that one of the two about equal-mass components has a close-by third 'perturber' component. In the present study we analyse the 35-Myr old visual triple system TYC 9300-0891-1AB + TYC 9300-0529-1 in the young Octans stellar association consisting of three equal-mass K0V components. We collected from the literature all information that allowed us to infer that the three components are actually physically bound forming a triple system and are members of the Octans Association. We collected broad-band photometric timeseries in two observation seasons. We discovered that all the components are variable, magnetically active, and from periodogram analysis we found the unresolved components TYC 9300-0891-1AB to have a rotation period P = 1.383d and TYC 9300-0529-1 a rotation period P = 1.634d. TYC 9300-0891-1A, TYC 9300-0891-1B, and TYC 9300-0529-1 have same masses, ages, and initial chemical compositions. The relatively small 16% rotation period difference measured by us indicates that all components had similar initial rotation periods and disc lifetimes, and the separation of 157AU between the component A and the 'perturber' component B (or vice-versa) has been sufficiently large to prevent any significant perturbation/shortening of the accretion-disc lifetime.
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