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Table 4

Naked star colours.

Teff (K) 3500 3200 2600
Spectral type(a) M4 M5–6 M9 (c)
J − Ks(b) (mag) 1.198 1.245 0.967
H − Ks (b) (mag) 0.231 0.244 0.222
KsKs(b) (mag) 0.000 0.000 0.000
Ks − [3.6] (mag) 0.115 0.104 0.320
Ks − [4.5] (mag) −0.004 0.038 0.449
Ks − [5.8] (mag) 0.032 0.051 0.473
Ks − [8.0] (mag) 0.194 0.161 0.596
KsA (mag) 0.052 0.041 0.504
KsC (mag) 0.208 0.228 0.796
KsD (mag) 0.216 0.242 0.822
KsE (mag) 0.225 0.275 0.888
KsW1 (mag) 0.081 0.009 0.151
KsW2 (mag) −0.031 0.006 0.425
KsW3 (mag) 0.207 0.219 0.759
KsW4 (mag) 0.218 0.271 0.887

Notes. The naked colours are based on models of stars with log(g) = 1 and solar metallicity by Allard et al. (2011). (a)Spectral types are based on the temperature scale of van Belle et al. (2021). (b)For M4, M5, and M6 stars, intrinsic J − Ks colours of 1.054, 1.164 and 1.208 mag, respectively, were measured by Glass & Schultheis (2002). While, Koornneef (1983) report J − K = 1.16 mag for an M4 and 1.30 for an M6, and H − K = 0.27 mag and 0.35 mag.(c)Perrin et al. (1998).

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