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arXiv 1901.08009astro-ph.IMastro-ph.SR
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用LSST在一个夜晚描述变星

Characterizing Variable Stars in a Single Night with LSST

Eric D. Feigelson, Frederica Bianco, Sara Bonito

摘要:

恒星表现出令人眼花缭乱的各种各样的变化行为,从爆炸性的磁耀斑到随机变化的吸积,再到周期性的脉动或旋转。主要的LSST调查将有节奏过于稀疏和不规则的捕捉大多数这些现象。本文提出了一个新的设想,即在一个漫长的冬夜,在一个测光带中,用连续的$\sim 15$二次曝光序列观测一个富含未被遮蔽恒星的单一银河场。其结果将是一个独特的数据集$\sim 1$百万定期间隔恒星光变曲线。光变曲线将给出一个特别全面的dM恒星变化的集合。一系列强大的统计程序可以应用于时间序列分析、信号处理和计量经济学等长期存在的领域的光变曲线的集成。可以提取几十个描述可变性的“特征”,并进行机器学习分类,对快速变星进行独特的权威客观分类。最有效的功能,然后可以通知更广泛的LSST社区的最佳方法,变星识别和分类的稀疏,不规则的节奏,占主导地位的LSST项目。

英文摘要:

Stars exhibit a bewildering variety of variable behaviors ranging from explosive magnetic flares to stochastically changing accretion to periodic pulsations or rotations. The principal LSST surveys will have cadences too sparse and irregular to capture most of these phenomena. A novel idea is proposed here to observe a single Galactic field, rich in unobscured stars, in a continuous sequence of $\sim 15$ second exposures for one long winter night in a single photometric band. The result will be a unique dataset of $\sim 1$ million regularly spaced stellar lightcurves. The lightcurves will gives a particularly comprehensive collection of dM star variability. A powerful array of statistical procedures can be applied to the ensemble of lightcurves from the long-standing fields of time series analysis, signal processing and econometrics. Dozens of `features' describing the variability can be extracted and subject to machine learning classification, giving a unique authoritative objective classification of rapidly variable stars. The most effective features can then inform the wider LSST community on the best approaches to variable star identification and classification from the sparse, irregular cadences that dominate the LSST project.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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