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Table 2
Definition of the bandpasses of the K-band indices.
| Index | Element | Central bandpass | Continuum bandpasses | Ref. |
| (μm) | (μm) | |||
|
|
||||
| Fe1 | Fe i | 1.9297–1.9327 | 1.9220–1.9260, 2.0030–2.0100 | (1) |
| Brδ | H i (n = 4) | 1.9425–1.9470 | 1.9220–1.9260, 2.0030–2.0100 | (1) |
| Ca1 | Ca i | 1.9500–1.9526 | 1.9220–1.9260, 2.0030–2.0100 | (1) |
| Fe23 | Fe i | 1.9583–1.9656 | 1.9220–1.9260, 2.0030–2.0100 | (1) |
| Si | Si i | 1.9708–1.9748 | 1.9220–1.9260, 2.0030–2.0100 | (1) |
| Ca2 | Ca i | 1.9769–1.9795 | 1.9220–1.9260, 2.0030–2.0100 | (1) |
| Ca3 | Ca i | 1.9847–1.9881 | 1.9220–1.9260, 2.0030–2.0100 | (1) |
| Ca4 | Ca i | 1.9917–1.9943 | 1.9220–1.9260, 2.0030–2.0100 | (1) |
| Mg1 | Mg i | 2.1040–2.1110 | 2.1000–2.1040, 2.1110–2.1150 | (2) |
| Brγ | H i (n = 4) | 2.1639–2.1686 | 2.0907–2.0951, 2.2873–2.2900 | (2) |
| Nad | Na i | 2.2000–2.2140 | 2.1934–2.1996, 2.2150–2.2190 | (3) |
| FeA | Fe i | 2.2250–2.2299 | 2.2133–2.2176, 2.2437–2.2479 | (4) |
| FeB | Fe i | 2.2368–2.2414 | 2.2133–2.2176, 2.2437–2.2479 | (4) |
| Cad | Ca i | 2.2594–2.2700 | 2.2516–2.2590, 2.2716–2.2888 | (3) |
| Mg2 | Mg i | 2.2795–2.2845 | 2.2700–2.2720, 2.2850–2.2874 | (4) |
| 12CO | 12CO(2,0) | 2.2910–2.3070 | 2.2516–2.2590, 2.2716–2.2888 | (3) |
References. (1) This paper, (2) Ivanov et al. (2004), (3) Cesetti et al. (2009), and (4) Silva et al. (2008).
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