Empirical instability strip for classical Cepheids - I. The Large Magellanic Cloud galaxy

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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 T_eff = α(log L − 3.3)+β, for F and 1O together and separately.

P [d]	α_blue	β_blue	σ_α, blue	σ_β, blue	α_red	β_red	σ_α, red	σ_β, 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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