Table 1.
Definition of the spectral indices.
| Index | Species | Bandpass definitions (μm) |
|
|---|---|---|---|
| name | Central | Blue and red continua | |
| Y atmospheric window | |||
| CSi | C I+Si I | 0.9400−0.9424 | 0.9390−0.9399 0.9425−0.9434 |
| Paϵ | H I(n = 3) | 0.9535−0.9570 | 0.9498−0.9504 0.9606−0.9614 |
| Ti | Ti I | 0.9780−0.9795 | 0.9750−0.9760 0.9800−0.9810 |
| TiO A | TiO | 0.9812−0.9826 | 0.9800−0.9810 0.9840−0.9850 |
| TiO B | TiO | 0.9885−0.9900 | 0.9840−0.9850 0.9985−0.9995 |
| FeH†, ♢ | FeH | 0.9900−0.9950 | 0.9840−0.9850 0.9985−0.9995 |
| Paδ | H I(n = 3) | 1.0040−1.0067 | 1.0020−1.0030 1.0067−1.0077 |
| FeTi | Fe I+Ti I | 1.0390−1.0408 | 1.0198−1.0210 1.0438−1.0446 |
| Fe | Fe I | 1.0422−1.0436 | 1.0198−1.0210 1.0438−1.0446 |
| VO | VO | 1.0456−1.0488 | 1.0438−1.0446 1.0640−1.0650 |
| Si‡ | Si I | 1.0676−1.0702 | 1.0640−1.0650 1.0892−1.0902 |
| CN | CN | 1.0868−1.0882 | 1.0640−1.0650 1.0892−1.0902 |
| Sr | Sr II | 1.0913−1.0923 | 1.0892−1.0902 1.0978−1.0988 |
| Paγ | H I(n = 3) | 1.0930−1.0950 | 1.0892−1.0902 1.0978−1.0988 |
| J atmospheric window | |||
| Na‡, † | Na I | 1.1358−1.1428 | 1.1320−1.1340 1.1430−1.1460 |
| FeCr‡ | Fe I+Cr I | 1.1600−1.1624 | 1.1560−1.1585 1.1716−1.1746 |
| K1 A†, ♢ | K I | 1.1670−1.1714 | 1.1560−1.1585 1.1716−1.1746 |
| C | C I | 1.1746−1.1765 | 1,1716−1.1746 1.1805−1.1815 |
| K1 B†, ♢ | K I | 1.1765−1.1800 | 1.1716−1.1746 1.1805−1.1815 |
| Mg‡ | Mg I | 1.1820−1.1840 | 1.1805−1.1815 1.1855−1.1875 |
| Si‡ | Si I | 1.1977−1.2004 | 1.1910−1.1935 1.2050−1.2070 |
| SiMg | Si I+Mg I | 1.2070−1.2095 | 1.2050−1.2070 1.2150−1.2180 |
| K2 A‡, ♢ | K I | 1.2415−1.2455 | 1.2350−1.2380 1.2460−1.2490 |
| K2 B♢ | K I | 1.2495−1.2540 | 1.2460−1.2490 1.2560−1.2580 |
| Paβ‡ | H I(n = 3) | 1.2795−1.2840 | 1.2755−1.2780 1.2855−1.2873 |
| Al‡, † | Al I | 1.3115−1.3168 | 1.3050−1.3075 1.3230−1.3250 |
| H atmospheric window | |||
| Mg1‡ | Mg I | 1.485−1.491 | 1.483−1.485 1.491−1.500 |
| Mg2‡, □ | Mg I | 1.500−1.508 | 1.491−1.508 1.510−1.512 |
| K1 | K I | 1.515−1.520 | 1.510−1.512 1.523−1.525 |
| Fe1 | Fe I | 1.528−1.533 | 1.523−1.525 1.548−1.550 |
| Br16 | H I(n = 4) | 1.552−1.557 | 1.548−1.550 1.593−1.594 |
| CO1‡ | 12CO(2,0) | 1.557−1.5635 | 1.548−1.550 1.593−1.594 |
| Br15 | H I | 1.567−1.572 | 1.548−1.550 1.593−1.594 |
| Mg3‡ | Mg I | 1.573−1.580 | 1.548−1.550 1.593−1.594 |
| FeH1‡, △, □ | FeH | 1.582−1.586 | 1.548−1.550 1.593−1.594 |
| Si‡, △, □ | Si I | 1.587−1.591 | 1.548−1.550 1.593−1.594 |
| CO2‡ | 12CO(2,0) | 1.595−1.600 | 1.593−1.594 1.616−1.618 |
| Fe2 | Fe I | 1.605−1.609 | 1.593−1.594 1.616−1.618 |
| Br13 | H I(n = 4) | 1.610−1.614 | 1.593−1.594 1.616−1.618 |
| CO3△ | 12CO(2,0) | 1.618−1.622 | 1.616−1.618 1.634−1.637 |
| FeH2 | FeH | 1.624−1.628 | 1.616−1.618 1.634−1.637 |
| CO4 | 12CO(2,0) | 1.639−1.647 | 1.634−1.637 1.6585−1.6605 |
| Fe3 | Fe I | 1.651−1.658 | 1.634−1.637 1.6585−1.6605 |
| CO5 | 12CO(2,0) | 1.6605−1.6640 | 1.6585−1.6605 1.6775−1.679 |
| Al1 | Al I | 1.6705−1.6775 | 1.6585−1.6605 1.6775−1.679 |
| Br11 | H I(n = 4) | 1.6790−1.6825 | 1.6775−1.679 1.6825−1.6835 |
| COMg□ | 12CO(2,0) | 1.705−1.713 | 1.692−1.696 1.714−1.716 |
| +Mg I | |||
| Br10 | H I(n = 4) | 1.735−1.739 | 1.725−1.728 1.744−1.748 |
| L atmospheric window | |||
| Mg1‡ | Mg I | 3.388−3.406 | 3.360−3.376 3.425−3.440 |
| Mg2‡ | Mg I | 3.454−3.464 | 3.425−3.440 3.476−3.496 |
| P16 | OH(1−0) P16 | 3.514−3.532 | 3.476−3.496 3.540−3.560 |
| P14 | OH(2−1) P14 | 3.564−3.582 | 3.540−3.560 3.604−3.612 |
| P17 | OH(1−0) P17 | 3.582−3.597 | 3.540−3.560 3.604−3.612 |
| P15 | OH(2−1) P15 | 3.628−3.648 | 3.604−3.612 3.665−3.673 |
| Pfγ | H I(n = 5) | 3.736−3.745 | 3.718−3.728 3.793−3.803 |
| Mg3‡ | Mg I | 3.862−3.870 | 3.840−3.850 3.870−3.880 |
| Hu15 | H I(n = 6) | 3.900−3.914 | 3.870−3.880 3.914−3.922 |
| SiO1 | SiO(2,0) | 3.998−4.012 | 3.990−3.998 4.025−4.035 |
| SiO2 | SiO(3,1) | 4.035−4.050 | 4.025−4.035 4.060−4.070 |
| SiO3 | SiO(4,2) | 4.080−4.090 | 4.060−4.070 4.095−4.105 |
Notes. We have marked with the symbol ‡ the index definitions similar to Riffel et al. (2019), with the symbol △ those similar to Origlia et al. (1993), with the symbol □ those similar to Ivanov et al. (2004), with the symbol † those similar to Conroy & van Dokkum (2012) and Villaume et al. (2017), and with the symbol ♢ those similar to McLean et al. (2003) and Cushing et al. (2005).
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