Data Structure ?
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Data Structure ?
*The above analysis is the result extracted and analyzed by the system, and the specific actual data shall prevail.
README.md
コンテキスト
[DASCHアーカイブ](http://dasch.rc.fas.harvard.edu/project.php)は、世紀規模の恒星の測光データを提供しています。物議を醸したことに、KIC 8462852（謎の恒星）は、DASCHの観測に基づいて、顕著な長期的な減光傾向があることが発見されました（Schaefer 2016）。それにもかかわらず、その後の研究（例えばLund et al. 2016）では、仮説として恒星の等級傾向がゼロである場合、名目上顕著なDASCH等級の傾きが偶然に予想されるよりも一般的であることが示されました。
Lund et al. (2016)のDASCHの傾きは、このデータセットで利用可能になっています。
内容
2つの表形式のファイルが提供されています：**KIC_stars.txt**（ケプラー入力カタログから）と**Tycho_stars.txt**（APASSカタログから）。
列は以下の通りです：
* ターゲットID（ケプラーIDまたはチコ2 ID）
* 完全な光度曲線の傾き（等級/世紀）
* 誤差
* 1970年以前（メンゼルギャップ）の光度曲線の傾き（等級/世紀）
* 誤差
* 1970年以降の光度曲線の傾き（等級/世紀）
* 誤差
謝辞
データセットのファイルは、2018年10月21日にマイケル・ランド博士からメールで提供されました。
参考文献
Lund et al. (2016). *The Stability of F-star Brightness on Century Timescales.* arXiv:1605.02760
Schaefer (2016). *KIC 8462852 Faded at an Average Rate of 0.165+-0.013 Magnitudes Per Century From 1890 To 1989.* arXiv:1601.03256
Sumin Tang et al. (2013). *Improved Photometry for the DASCH pipeline.* arXiv:1304.7504
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