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

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Volume 682 (February 2024)

A&A, 682 (2024) A185

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Table 1.

Coefficients of the red and blue edges of the IS considering a break at P = 3 d, assuming (V − I)₀ = α(M_I + 3.5)+β, for F and 1O mode 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	−0.038	0.491	0.001	0.001	−0.078	0.734	0.003	0.004
> 3 d	−0.086	0.475	0.002	0.001	−0.100	0.702	0.001	0.001
All	−0.059	0.490	0.0004	0.0002	−0.076	0.71	0.001	0.0004

F Cepheids

> 3 d	−0.046	0.553	0.007	0.003	−0.102	0.785	0.022	0.020
> 3 d	−0.069	0.535	0.005	0.004	−0.118	0.712	0.003	0.002
All	−0.043	0.553	0.002	0.001	−0.089	0.727	0.001	0.001

1O Cepheids

> 3 d	−0.042	0.488	0.002	0.003	−0.025	0.643	0.003	0.004
> 3 d	−0.065	0.466	0.006	0.004	−0.086	0.588	0.009	0.004
All	−0.038	0.482	0.001	0.001	−0.014	0.625	0.001	0.001

Notes. In addition, we include the coefficients for a fit without a break.

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