Open Access
Table 1.
Intrinsic color index (BP − RP)0 of Galactic RSGs and their EW(CaT).
| Spectral type | Teff (K) | EW(CaT) (nm) | (BP − RP)0MIST |
|---|---|---|---|
| K1 | 4100 | ≥1.100 | 1.548 |
| M2 | 3660 | 1.100 | 1.999 |
| M3 | 3605 | 0.955 | 2.086 |
| M4 | 3535 | 0.810 | 2.221 |
| M5 | 3450 | 0.665 | 2.469 |
| M6 | – | 0.520 | – |
| M7 | – | 0.375 | – |
| M8 | – | 0.230 | – |
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