A survey for variable young stars with small telescopes - IV. Rotation periods of YSOs in IC 5070
A survey for variable young stars with small telescopes - IV. Rotation periods of YSOs in IC 5070
复制标题
用小型望远镜对变年轻恒星进行的调查 - IV。
DOI：
10.1093/mnras/stab2082
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发表时间：
2021
影响因子：
4.8
通讯作者：
Froebrich D
中科院分区：
文献类型：
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作者：
Froebrich D
研究年轻恒星的旋转变化使我们能够研究年轻恒星盘系统的许多特性。我们利用高节奏，多波长光学时间序列数据从狩猎爆发的年轻恒星公民科学项目，以确定周期性变量的派力肯星云（IC 5070）。使用9种不同的周期发现算法进行双盲研究，并确定了59个周期变量的样本。我们发现，四个时期的发现算法的组合可以实现85%的完整性和30%的污染，在非均匀的数据集确定期间。性能最好的方法是依赖于拟合正弦曲线的周期图。利用GaiaEDR3数据，我们已经确定了一个公正的样本40个周期性的年轻恒星天体（YSO），没有使用任何颜色或大小的选择。在98.9%的概率下，我们可以排除均匀的YSO周期分布。相反，我们发现一个双峰分布的峰值在3和8 d。该样本的光盘分数为50%，其统计特性与其他年龄相似的YSO人群一致。特别是，我们确认了圆盘的存在与主要的慢旋转有关，并发现了4.8 × 10− 3的概率，即观察到的周期和圆盘存在之间的关系是偶然发生的。在我们的周期变星样本中，我们还发现了脉动巨星、食双星和IC 5070前景中潜在的YSO。
Studying rotational variability of young stars is enabling us to investigate a multitude of properties of young star-disc systems. We utilize high cadence, multiwavelength optical time series data from the Hunting Outbursting Young Stars citizen science project to identify periodic variables in the Pelican Nebula (IC 5070). A double blind study using nine different period-finding algorithms was conducted and a sample of 59 periodic variables was identified. We find that a combination of four period finding algorithms can achieve a completeness of 85 per cent and a contamination of 30 per cent in identifying periods in inhomogeneous data sets. The best performing methods are periodograms that rely on fitting a sine curve. UtilizingGaiaEDR3 data, we have identified an unbiased sample of 40 periodic young stellar objects (YSOs), without using any colour or magnitude selections. With a 98.9 per cent probability, we can exclude a homogeneous YSO period distribution. Instead, we find a bi-modal distribution with peaks at 3 and 8 d. The sample has a disc fraction of 50 per cent, and its statistical properties are in agreement with other similarly aged YSOs populations. In particular, we confirm that the presence of the disc is linked to predominantly slow rotation and find a probability of 4.8 × 10−3that the observed relation between period and presence of a disc has occurred by chance. In our sample of periodic variables, we also find pulsating giants, an eclipsing binary, and potential YSOs in the foreground of IC 5070.