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Table 2
Colour polynomials of M5–T8 dwarfs.
| Colour | a0 | a1 | a2 | a3 | a4 | a5 | a6 |
|
|
|||||||
| i − z | –9.251 | +3.99519 | –0.540767 | +0.03437326 | –0.001010273 | +1.114655e-05 | 0 |
| z − Y | –0.942 | +0.44857 | –0.040668 | +0.00157836 | –1.9718e-05 | 0 | 0 |
| Y − J (<L7) | –0.174 | +0.16790 | –0.004615 | 0 | 0 | 0 | 0 |
| Y − J (>L8) | +1.312 | –0.00592 | 0 | 0 | 0 | 0 | 0 |
| J − H | –2.084 | +1.17016 | –0.199519 | +0.01610708 | –0.000593708 | +7.94462e-06 | 0 |
| H − K | –1.237 | +0.69217 | –0.114951 | +0.00946462 | –0.000361246 | +5.00657e-06 | 0 |
| K − W1 | –4.712 | +2.37847 | –0.444094 | +0.04074163 | –0.001910084 | +4.367540e-05 | –3.83500e-07 |
| W1 − W2 | –0.364 | +0.17264 | –0.015729 | +0.00048514 | 0 | 0 | 0 |
Notes. Dependence of colour c on spectral type t defined by polynomials 
, where the correspondence between t and spectral type is 5 − 9 represents M5−M9, 10−19 represents L0−L9, and 20−28 represents T0−T8. The polynomials are valid over M5−T8. All photometry is on the Vega system.
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