Distance to the globular cluster M 3 from the infrared surface brightness technique applied to RR Lyrae stars

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Table 3

Coefficients of the log (〈R〉/R_⊙) = a × (log P + 0.25) + b relation together with their uncertainties and the rms scatter around the fitted relation obtained in this work depending on the SBCR.

SBCR	a	σ_a	b	σ_b	rms
BISECTOR

Kervella et al. (2004a)	0.562	0.025	0.7325	0.0014	0.0048
Kervella et al. (2004b)	0.551	0.025	0.7390	0.0014	0.0047
Graczyk et al. (2021)	0.561	0.027	0.7220	0.0015	0.0051
Salsi et al. (2021)	0.572	0.028	0.7224	0.0015	0.0052
Bailleul et al. (2025)	0.552	0.026	0.7268	0.0014	0.0050

LEAST SQUARES

Kervella et al. (2004a)	0.564	0.025	0.7242	0.0014	0.0048
Kervella et al. (2004b)	0.552	0.024	0.7328	0.0014	0.0046
Graczyk et al. (2021)	0.564	0.027	0.7236	0.0015	0.0050
Salsi et al. (2021)	0.575	0.027	0.7213	0.0015	0.0052
Bailleul et al. (2025)	0.555	0.027	0.7288	0.0014	0.0049

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