Intrinsic and extinction colour components in SNe Ia and the determination of RV

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Table 8.

Residual (mag) dependence on the extinction colour R_V = 2.25 (after correction of the extinction formula).

Index	Colour	dϵ/dX₃	Error (σ)	Residual (σ)	dϵ/dX₃
		no corr.	on slope (no corr.)	with corr.	with corr.
0	U − B	0.1138	0.0235	0.0201	−0.0023
1	U − V	0.0319	0.0059	0.0114	−0.00127
2	U − R	−0.0498	0.0054	0.0153	0.00400
3	U − I	0.0194	0.0029	0.0089	0.00021
4	B − V	−0.0273	0.0272	0.0294	0.00493
5	B − R	−0.0995	0.0125	0.0250	0.00915
6	B − I	−0.0107	0.0050	0.0137	−0.00177
7	V − R	−0.2293	0.0286	0.0248	0.02164
8	V − I	−0.0079	0.0086	0.0127	−0.00035
9	R − I	0.0370	0.0271	0.0150	0.01268

Notes. The corrections are introduced in Table 7 and the residuals are displayed in Fig. 6.

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