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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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