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Table 1
Coefficients of PL relations of fundamental-mode and first-overtone Cepheids.
| Data | αλ |
|
σ |
|
|
|||
| Fundamental-mode Cepheids | |||
|
|
|||
| This study, break point at log(P) = 0.47 | |||
| V-band data with log (P) > 0.47 | − 2.67 ± 0.041 | 17.82 ± 0.032 | 0.28 |
| V-band data with log (P) < 0.47 | − 3.19 ± 0.053 | 18.06 ± 0.013 | 0.26 |
| I-band data with log (P) > 0.47 | − 2.93 ± 0.032 | 17.26 ± 0.025 | 0.22 |
| I-band data with log (P) < 0.47 | − 3.37 ± 0.043 | 17.47 ± 0.011 | 0.21 |
|
|
|||
| Tammann et al. (2011), break point at log(P) = 0.55. Adopted (m – M)0 = 18.93. | |||
| V-band data with log (P) > 0.55 | − 2.53 ± 0.056 | − 1.466 ± 0.050 | 0.25 |
| V-band data with log (P) < 0.55 | − 3.20 ± 0.060 | − 1.071 ± 0.018 | 0.22 |
| I-band data with log (P) > 0.55 | − 2.84 ± 0.043 | − 1.872 ± 0.038 | 0.19 |
| I-band data with log (P) < 0.55 | − 3.37 ± 0.046 | − 1.577 ± 0.013 | 0.17 |
|
|
|||
| First-overtone Cepheids | |||
|
|
|||
| This study, break point at log(P) = 0.029 | |||
| V-band data with log (P) > 0.029 | − 3.03 ± 0.056 | 17.33 ± 0.016 | 0.27 |
| V-band data with log (P) < 0.029 | − 3.59 ± 0.125 | 17.35 ± 0.017 | 0.30 |
| I-band data with log (P) > 0.029 | − 3.23 ± 0.045 | 16.79 ± 0.013 | 0.22 |
| I-band data with log (P) < 0.029 | − 3.63 ± 0.101 | 16.81 ± 0.014 | 0.25 |
|
|
|||
| Tammann et al. (2011), break point at log(P) = 0.4. Adopted (m – M)0 = 18.93. | |||
| V-band data with log (P) > 0.4 | − 2.53 ± 0.056 | − 2.028 ± 0.026 | 0.24 |
| V-band data with log (P) < 0.4 | − 3.20 ± 0.060 | − 1.759 ± 0.010 | 0.25 |
| I-band data with log (P) > 0.4 | − 2.84 ± 0.043 | − 2.423 ± 0.020 | 0.19 |
| I-band data with log (P) < 0.4 | − 3.74 ± 0.046 | − 2.210 ± 0.008 | 0.19 |
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