A new implementation of the infrared flux method using the 2MASS catalogue

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Table 5:

Coefficients and range of applicability of the $T_{\rm eff}$ :colour-[Fe/H] calibrations.
Colour	Colour range	[Fe/H] range	b₀	b₁	b₂	b₃	b₄	b₅	N^a	$\sigma_{T_{\rm eff}}({\rm K})^{b}$
Dwarf stars
B-V	[0.2, 1.3]	[-3.5, 0.5]	0.5725	0.4722	0.0086	-0.0628	-0.0038	-0.0051	418	76
V-R	[0.2, 0.8]	[-3.1, 0.3]	0.4451	1.4561	-0.6893	-0.0944	0.0161	-0.0038	164	45
V-I	[0.5, 1.4]	[-3.1, 0.3]	0.4025	0.8324	-0.2041	-0.0555	0.0410	-0.0003	164	52
V-J	[0.5, 2.3]	[-3.5, 0.5]	0.4997	0.3504	-0.0230	-0.0295	0.0468	0.0037	430	36
V-H	[0.6, 2.8]	[-3.5, 0.5]	0.5341	0.2517	-0.0100	-0.0236	0.0523	0.0044	426	30
$V-K_{\rm s}$	[0.7, 3.0]	[-3.5, 0.5]	0.5201	0.2511	-0.0118	-0.0186	0.0408	0.0033	431	32
$J-K_{\rm s}$	[0.1, 0.8]	[-3.5, 0.5]	0.6524	0.5813	0.1225	-0.0646	0.0370	0.0016	436	139
Giant stars
B-V	[0.3, 1.4]	[-4.0, 0.2]	0.4967	0.7260	-0.1563	0.0255	-0.0585	-0.0061	120	57
V-R	[0.3, 0.7]	[-4.0, 0.1]	0.4530	1.4347	-0.5883	-0.0156	-0.0096	-0.0039	55	85
V-J	[1.0, 2.4]	[-4.0, 0.2]	0.4629	0.4124	-0.0417	-0.0012	0.0094	0.0013	138	18
V-H	[0.8, 3.1]	[-4.0, 0.2]	0.5321	0.2649	-0.0146	-0.0069	0.0211	0.0009	144	23
$V-K_{\rm s}$	[1.1, 3.4]	[-4.0, 0.2]	0.5293	0.2489	-0.0119	-0.0042	0.0135	0.0010	145	23
$J-K_{\rm s}$	[0.1, 0.9]	[-4.0, 0.2]	0.6517	0.6312	0.0168	-0.0381	0.0256	0.0013	145	94

^a The remaining number of stars after several iterations (usually less than 20) of the 2.5 $\sigma$ clipping. ^b $\sigma_{T_{\rm eff}}$ , given in K, is the standard deviation of the final calibrations.

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