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Table 3
Variability features.
| Feature | A brief description. For details, see Appendix A. |
|
|
|
| Period | Period derived by the Lomb-Scargle algorithm |
| Period S/N | Signal-to-noise ratio of the derived period |
| η | Ratio of the mean of square of successive differences to the variance of data points |
| η B − R | η over a BE – RE light curve |
| ψ η | η over a phase-folded light curve |
| η e | Modified η |
| B E | Mean magnitude of BE band |
| BE − RE | Color. Difference of mean magnitude of BE and RE bands |
| Q 3−1 | 3rd quartile (75%) – 1st quartile (25%) |
| Q 3−1 | B − R | 3rd quartile (75%) – 1st quartile (25%) over a BE – RE light curve |
| Cusum | Range of cumulative sum |
| ψ CS | Cusum over a phase-folded light curve |
| σ | Standard deviation |
| γ 1 | Skewness |
| γ 2 | Kurtosis |
| J | Stetson J index |
| K | Stetson K index |
| K AC | Stetson K index derived over an autocorrelation function of a light curve |
| R 21 | 2nd-to-1st amplitude ratio derived using the Fourier decomposition |
| R 31 | 3rd-to-1st amplitude ratio derived using the Fourier decomposition |
| φ 21 | Difference between 2nd and 1st phases derived using the Fourier decomposition |
| φ 31 | Difference between 3rd and 1st phases derived using the Fourier decomposition |
Notes.We used EROS BE-band light curves (either raw- or phase-folded) to derive these features, except for J, Q3−1 | B − R and ηB − R, which needs both BE- and RE-band light curves. See Appendix A for details.
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