The stellar evolution perspective on the metallicity dependence of classical Cepheid Leavitt laws

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Volume 702 (October 2025)

A&A, 702 (2025) A235

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Table 2.

Metallicity parameters β_M and α_M predicted with SYCLIST populations, either letting the LL slope vary or be fixed to the LMC value (last two columns), for different pivot periods: log P₀ = 0.0, 0.7, and 1.0.

Band	β_M	σ_{β_M}	α_M	σ_{α_M}	α_M	σ_{α_M}	α_M	σ_{α_M}	α_{M, fixed β}	σ_{α_{M, fixed β}}
			[0.0]	[0.0]	[0.7]	[0.7]	[1.0]	[1.0]
G_BP	0.372	0.158	−0.273	0.130	−0.013	0.020	0.099	0.028	−0.017	0.006
V	0.377	0.149	−0.287	0.125	−0.023	0.021	0.090	0.024	−0.032	0.006
G	0.320	0.128	−0.267	0.113	−0.043	0.023	0.053	0.015	−0.049	0.001
G_RP	0.305	0.096	−0.290	0.095	−0.077	0.028	0.015	0.001	−0.092	0.004
I	0.302	0.092	−0.293	0.093	−0.082	0.028	0.009	0.001	−0.097	0.004
F090W	0.266	0.086	−0.289	0.091	−0.103	0.030	−0.023	0.005	−0.116	0.010
F115W	0.226	0.065	−0.287	0.079	−0.128	0.033	−0.060	0.014	−0.141	0.015
J	0.208	0.059	−0.276	0.075	−0.130	0.034	−0.067	0.016	−0.142	0.017
F150W	0.171	0.043	−0.277	0.067	−0.157	0.037	−0.106	0.024	−0.169	0.022
H	0.148	0.033	−0.275	0.062	−0.171	0.038	−0.127	0.028	−0.183	0.026
K_s	0.139	0.027	−0.276	0.058	−0.179	0.039	−0.137	0.031	−0.191	0.027
F277W	0.148	0.028	−0.280	0.058	−0.177	0.039	−0.133	0.031	−0.190	0.026
F356W	0.127	0.024	−0.270	0.056	−0.181	0.039	−0.143	0.032	−0.192	0.028
F444W	0.141	0.028	−0.274	0.058	−0.175	0.039	−0.132	0.030	−0.187	0.026

W_G	0.193	0.011	−0.300	0.046	−0.165	0.039	−0.107	0.036	−0.190	0.019
W_VI	0.197	0.013	−0.300	0.048	−0.162	0.039	−0.103	0.035	−0.188	0.019
W_H	0.115	0.016	−0.273	0.052	−0.192	0.041	−0.158	0.036	−0.204	0.030
W_VK	0.109	0.011	−0.275	0.049	−0.198	0.041	−0.166	0.038	−0.211	0.031
W_JK	0.088	0.003	−0.276	0.045	−0.215	0.043	−0.188	0.042	−0.227	0.034

Notes. NB: Our models do not predict many 1 d fundamental-mode Cepheids, cf. Fig. 3. Hence, the results at log P₀ = 0.0 are an extrapolation and other pivot periods should be preferentially considered.

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