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).
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.