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Table 2.
Spectral indices used in this work.
| Index | Range of validity | Numerator (Å) | Denominator (Å) | Ref. |
|---|---|---|---|---|
| R1 | M2.5–M8 | 8025–8130 | 8015–8025 | 1 |
| R2 | M3–M8 | 8145–8460 | 8460–8470 | 1 |
| R3 | M2.5–M8 | (8025–8130) + (8415–8460) | (8015–8025) + (8460–8470) | 1 |
| TiO 8465 | M3–M8 | 8405–8425 | 8455–8475 | 1 |
| VO 2 | M3–M8 | 7920–7960 | 8130–8150 | 1 |
| VO 7445 | M5–M8 | 0.5625(7350–7400) + 0.4375(7510–7560) | 7420–7470 | 1 |
| R5150 (a) | K0–M0 | 5050–5150 | 4600–4700 | 2 |
| TiO 7140 (b) | M0–M4.5 | 7005–7035 | 7130–7155 | 2 |
| TiO 7700 | M3–M8 | 8120–8160 | 7750–7800 | 2 |
| TiO 8465 | M4–M8 | 8345–8385 | 8455–8475 | 2 |
| TiO 7140 | K5–M6 | 7020–7050 | 7125–7155 | 3 |
Notes. All spectral indices are calculated from the ratio between the average flux of the numerator (N) and denominator (D), except the following cases:
References. (1) Riddick et al. (2007); (2) Herczeg & Hillenbrand (2014); (3) Jeffries et al. (2007), Oliveira et al. (2003).
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