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Table 2.
Coefficients of the red and blue edges of the IS considering a break at P = 3 d, assuming log Teff = α(log L − 3.3)+β, for F and 1O together and separately.
| P [d] | αblue | βblue | σα, blue | σβ, blue | αred | βred | σα, red | σβ, red |
|---|---|---|---|---|---|---|---|---|
| F and 1O Cepheids | ||||||||
| < 3 d | −0.021 | 3.805 | 0.001 | 0.0004 | −0.057 | 3.732 | 0.002 | 0.002 |
| > 3 d | −0.058 | 3.800 | 0.001 | 0.0001 | −0.074 | 3.737 | 0.001 | 0.0002 |
| All | −0.035 | 3.802 | 0.0002 | 0.0001 | −0.055 | 3.740 | 0.0004 | 0.0001 |
| F Cepheids | ||||||||
| < 3 d | −0.027 | 3.788 | 0.004 | 0.002 | −0.045 | 3.732 | 0.008 | 0.004 |
| > 3 d | −0.048 | 3.788 | 0.004 | 0.001 | −0.094 | 3.728 | 0.002 | 0.001 |
| All | −0.032 | 3.787 | 0.001 | 0.0004 | −0.072 | 3.729 | 0.0004 | 0.0002 |
| 1O Cepheids | ||||||||
| < 3 d | −0.030 | 3.801 | 0.001 | 0.001 | −0.017 | 3.768 | 0.003 | 0.002 |
| > 3 d | −0.038 | 3.807 | 0.004 | 0.0004 | −0.062 | 3.774 | 0.007 | 0.001 |
| All | −0.023 | 3.807 | 0.001 | 0.0002 | −0.009 | 3.776 | 0.001 | 0.0002 |
Notes. In addition, we include the coefficients without break.
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