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 |
Ks − Ks(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 |
Ks − A | (mag) | 0.052 | 0.041 | 0.504 |
Ks − C | (mag) | 0.208 | 0.228 | 0.796 |
Ks − D | (mag) | 0.216 | 0.242 | 0.822 |
Ks − E | (mag) | 0.225 | 0.275 | 0.888 |
Ks − W1 | (mag) | 0.081 | 0.009 | 0.151 |
Ks − W2 | (mag) | −0.031 | 0.006 | 0.425 |
Ks − W3 | (mag) | 0.207 | 0.219 | 0.759 |
Ks − W4 | (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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