The ASAS-SN catalogue of variable stars – IV. Periodic variables in the APOGEE survey
The ASAS-SN catalogue of variable stars – IV. Periodic variables in the APOGEE survey
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DOI：
10.1093/mnras/stz1681
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发表时间：
2019-06
影响因子：
4.8
通讯作者：
M. Pawlak;O. Pejcha;P. Jakubcik;T. Jayasinghe;C. Kochanek;K. Stanek;B. Shappee;T. Holoien;
中科院分区：
文献类型：
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作者：
M. Pawlak;O. Pejcha;P. Jakubcik;T. Jayasinghe;C. Kochanek;K. Stanek;B. Shappee;T. Holoien;
我们探索光度测量和光谱测量之间的协同作用，方法是使用全天自动超新星测量(ASAS-SN)在阿帕奇点观测星系演化实验(APOEE)观察到的目标中搜索周期变星。我们在超过258,000美元的远地点目标中确定了1924个周期变量；其中465个是新发现的。我们对430颗食和椭球双星、139颗经典脉动星(造父变星、天琴座RR和δScuti)、719颗长周期变星(脉动红巨星)和636颗自转变星进行了均匀分类。使用视觉检查和机器学习技术进行搜索。光强曲线也用带阻尼的随机游走随机过程来建模。我们发现，可变天体的中位数[Fe/H]比整个远地点样本的中位数低0.3度。食双星和椭球变量被移动到较低的中位数[Fe/H]0.2Dex。日食双星和自转变星比样本的其余部分表现出明显更宽的谱线。我们公开了所有远地点恒星的AAS-SN光曲线，并提供了可变天体的参数。
We explore the synergy between photometric and spectroscopic surveys by searching for periodic variable stars among the targets observed by the Apache Point Observatory Galactic Evolution Experiment (APOGEE) using photometry from the All-Sky Automated Survey for Supernovae (ASAS-SN). We identified 1924 periodic variables among more than $258\, 000$ APOGEE targets; 465 are new discoveries. We homogeneously classified 430 eclipsing and ellipsoidal binaries, 139 classical pulsators (Cepheids, RR Lyrae, and δ Scuti), 719 long-period variables (pulsating red giants), and 636 rotational variables. The search was performed using both visual inspection and machine learning techniques. The light curves were also modelled with the damped random walk stochastic process. We find that the median [Fe/H] of variable objects is lower by 0.3 dex than that of the overall APOGEE sample. Eclipsing binaries and ellipsoidal variables are shifted to a lower median [Fe/H] by 0.2 dex. Eclipsing binaries and rotational variables exhibit significantly broader spectral lines than the rest of the sample. We make ASAS-SN light curves for all the APOGEE stars publicly available and provide parameters for the variable objects.