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Table 1.
Vacuum wavelength ranges used for the spectroscopic indices.
| Purpose of wavelength range | Wavelength range [μm] |
|---|---|
| CO continuum | 2.2300–2.2370 |
| CO continuum | 2.2420–2.2580 |
| CO continuum | 2.2680–2.2790 |
| CO continuum | 2.2840–2.2910 |
| CO feature | 2.2910–2.3020 |
| Br γ continuum | 2.13112–2.15112 |
| Br γ | 2.16412-2.16812 |
| Br γ continuum | 2.18112–2.20112 |
| Na continuum | 2.1910–2.1966 |
| Na feature | 2.2040–2.2107 |
| Na continuum | 2.2125–2.2170 |
| Ca continuum | 2.2450–2.2560 |
| Ca feature | 2.2577–2.2692 |
| Ca continuum | 2.2700–2.2720 |
| H2 O feature | 1.9850–1.9990 |
| H2 O continuum | 2.1800–2.2040 |
| H2 O continuum | 2.2107–2.2577 |
| H2 O continuum | 2.2692–2.2910 |
Notes. For CO 2-0, Na I, and Ca I the definitions of Frogel et al. (2001) are used, while the Brackett γ and H2O index range are defined by us. The details about the indices are explained in the text.
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