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Table A.1.
Adopted spectral type-temperature relation for SMC stars with different spectral types and luminosity classes.
| SpT | SpT_nr | V_IV_Teff [kK] | V_IV_note | III_II_Teff [kK] | III_II_note | I_Teff [kK] | I_note |
|---|---|---|---|---|---|---|---|
| O2 | 2.0 | 51.7 | from III_II_Teff | 51.7 | 51.7 | from III_II_Teff | |
| O3 | 3.0 | 46.0 | 49.5 | int. | 49.5 | from III_II_Teff | |
| O4 | 4.0 | 43.4 | 47.3 | int. | 47.3 | from III_II_Teff | |
| O4.5 | 4.5 | 42.8 | int. | 46.2 | int. | 46.2 | from III_II_Teff |
| O5 | 5.0 | 42.2 | 45.0 | int. | 45.0 | from III_II_Teff | |
| O5.5 | 5.5 | 41.2 | int. | 43.0 | int. | 43.9 | from III_II_Teff |
| O6 | 6.0 | 40.3 | 42.8 | int. | 42.8 | from III_II_Teff | |
| O6.5 | 6.5 | 39.3 | 40.6 | int. | 40.6 | from III_II_Teff | |
| O7 | 7.0 | 38.1 | 38.4 | 34.1 | |||
| O7.5 | 7.5 | 37.3 | int. | 37.7 | int. | 34.1 | int. |
| O8 | 8.0 | 36.5 | 36.9 | 33.0 | int. | ||
| O8.5 | 8.5 | 35.1 | 34.3 | 31.8 | int. | ||
| O9 | 9.0 | 34.5 | 33.4 | int. | 30.7 | ||
| O9.5 | 9.5 | 33.7 | 32.1 | 30.0 | int. | ||
| O9.7 | 9.7 | 32.1 | 30.8 | 29.4 | int. | ||
| B0 | 10.0 | 31.1 | 29.5 | int. | 28.6 | ||
| B0.2 | 10.2 | 29.6 | 28.3 | 27.5 | int. | ||
| B0.5 | 10.5 | 28.3 | 26.8 | 26.4 | |||
| B0.7 | 10.7 | 26.8 | 25.5 | 25.0 | int. | ||
| B1 | 11.0 | 25.3 | 24.5 | 23.5 | |||
| B1.5 | 11.5 | 23.1 | 22.7 | 21.3 | |||
| B2 | 12.0 | 21.1 | 21.3 | 18.9 | |||
| B2.5 | 12.5 | 19.4 | 19.6 | 16.9 | |||
| B3 | 13.0 | 17.7 | 17.5 | 15.3 | |||
| B4 | 14.0 | 16.9 | int. | 16.2 | int. | 14.6 | int. |
| B5 | 15.0 | 16.2 | 14.9 | 13.9 | |||
| B6 | 16.0 | 15.0 | int. | 14.3 | int. | 13.3 | int. |
| B7 | 17.0 | 13.8 | 13.8 | int. | 12.7 | int. | |
| B8 | 18.0 | 14.0 | 12.9 | 12.1 | |||
| B9 | 19.0 | 10.6 | from I_Teff | 10.6 | from I_Teff | 10.6 | |
| A0 | 20.0 | 9.5 | from I_Teff | 9.5 | from I_Teff | 9.5 | E03 |
| A1 | 21.0 | 9.0 | from I_Teff | 9.0 | from I_Teff | 9.0 | int. E03 |
| A2 | 22.0 | 8.5 | from I_Teff | 8.5 | from I_Teff | 8.5 | E03 |
| A3 | 23.0 | 8.0 | from I_Teff | 8.0 | from I_Teff | 8.0 | E03 |
| A4 | 24.0 | 7.875 | from I_Teff | 7.875 | from I_Teff | 7.875 | int. E03 |
| A5 | 25.0 | 7.75 | from I_Teff | 7.75 | from I_Teff | 7.75 | E03 |
| A6 | 26.0 | 7.5 | from I_Teff | 7.5 | from I_Teff | 7.5 | int. E03 |
| A7 | 27.0 | 7.25 | from I_Teff | 7.25 | from I_Teff | 7.25 | E03 |
| A8 | 28.0 | 7.08 | from I_Teff | 7.08 | from I_Teff | 7.08 | int. E03 |
| A9 | 29.0 | 6.92 | from I_Teff | 6.92 | from I_Teff | 6.92 | int. E03 |
| F0 | 30.0 | 6.75 | from I_Teff | 6.75 | from I_Teff | 6.75 | E03 |
| F1 | 31.0 | 6.575 | from I_Teff | 6.575 | from I_Teff | 6.575 | int. E03 |
| F2 | 32.0 | 6.4 | from I_Teff | 6.4 | from I_Teff | 6.4 | int. E03 |
| F3 | 33.0 | 6.225 | from I_Teff | 6.225 | from I_Teff | 6.225 | int. E03 |
| F4 | 34.0 | 6.05 | from I_Teff | 6.05 | from I_Teff | 6.05 | int. E03 |
| F5 | 35.0 | 5.875 | from I_Teff | 5.875 | from I_Teff | 5.875 | E03 |
| F6 | 36.0 | 5.803 | from I_Teff | 5.803 | from I_Teff | 5.803 | int. E03 and T18 |
| F7 | 37.0 | 5.731 | from I_Teff | 5.731 | from I_Teff | 5.731 | int. E03 and T18 |
| F8 | 38.0 | 5.650 | from I_Teff | 5.650 | from I_Teff | 5.650 | int. E03 and T18 |
| F9 | 39.0 | 5.588 | from I_Teff | 5.588 | from I_Teff | 5.588 | int. E03 and T18 |
| G0 | 40.0 | 5.516 | from I_Teff | 5.516 | from I_Teff | 5.516 | T18 |
| G1 | 41.0 | 5.081 | from I_Teff | 5.081 | from I_Teff | 5.081 | T18 |
| G2 | 42.0 | 4.804 | from I_Teff | 4.804 | from I_Teff | 4.804 | int. T18 |
| G3 | 43.0 | 4.526 | from I_Teff | 4.526 | from I_Teff | 4.526 | T18 |
| G4 | 44.0 | 4.503 | from I_Teff | 4.503 | from I_Teff | 4.503 | T18 |
| G5 | 45.0 | 4.657 | from I_Teff | 4.657 | from I_Teff | 4.657 | T18 |
| G6 | 46.0 | 4.472 | from I_Teff | 4.472 | from I_Teff | 4.472 | T18 |
| G7 | 47.0 | 4.202 | from I_Teff | 4.202 | from I_Teff | 4.202 | T18 |
| G8 | 48.0 | 4.202 | from I_Teff | 4.202 | from I_Teff | 4.202 | T18 |
| K0 | 49.0 | 4.135 | from I_Teff | 4.135 | from I_Teff | 4.135 | T18 |
| K1 | 50.0 | 4.077 | from I_Teff | 4.077 | from I_Teff | 4.077 | T18 |
| K2 | 51.0 | 4.059 | from I_Teff | 4.059 | from I_Teff | 4.059 | T18 |
| K3 | 52.0 | 4.050 | from I_Teff | 4.050 | from I_Teff | 4.050 | T18 |
| K4 | 53.0 | 4.024 | from I_Teff | 4.024 | from I_Teff | 4.024 | T18 |
| K5 | 54.0 | 3.976 | from I_Teff | 3.976 | from I_Teff | 3.976 | T18 |
| K6-9 | 3.976 | from I_Teff | 3.976 | from I_Teff | 3.976 | As K5 in T18 | |
| M0 | 55.0 | 3.942 | from I_Teff | 3.942 | from I_Teff | 3.942 | T18 |
| M1 | 56.0 | 3.856 | from I_Teff | 3.856 | from I_Teff | 3.856 | T18 |
| M2 | 57.0 | 3.802 | from I_Teff | 3.802 | from I_Teff | 3.802 | T18 |
| M3 | 58.0 | 3.610 | from I_Teff | 3.610 | from I_Teff | 3.610 | T18 |
| M4-6 | 3.610 | from I_Teff | 3.610 | from I_Teff | 3.610 | as M3 in T18 | |
| K0 | 49.0 | 4.135 | from I_Teff | 4.135 | from I_Teff | 4.135 | T18 |
| K1 | 50.0 | 4.077 | from I_Teff | 4.077 | from I_Teff | 4.077 | T18 |
| K2 | 51.0 | 4.059 | from I_Teff | 4.059 | from I_Teff | 4.059 | T18 |
| K3 | 52.0 | 4.050 | from I_Teff | 4.050 | from I_Teff | 4.050 | T18 |
| K4 | 53.0 | 4.024 | from I_Teff | 4.024 | from I_Teff | 4.024 | T18 |
| K5 | 54.0 | 3.976 | from I_Teff | 3.976 | from I_Teff | 3.976 | T18 |
| K6-9 | 3.976 | from I_Teff | 3.976 | from I_Teff | 3.976 | As K5 in T18 | |
| M0 | 55.0 | 3.942 | from I_Teff | 3.942 | from I_Teff | 3.942 | T18 |
| M1 | 56.0 | 3.856 | from I_Teff | 3.856 | from I_Teff | 3.856 | T18 |
| M2 | 57.0 | 3.802 | from I_Teff | 3.802 | from I_Teff | 3.802 | T18 |
| M3 | 58.0 | 3.610 | from I_Teff | 3.610 | from I_Teff | 3.610 | T18 |
| M4-6 | 3.610 | from I_Teff | 3.610 | from I_Teff | 3.610 | as M3 in T18 |
Notes. In the notes, we mention possible interpolation from neighboring spectral types (‘int.’), or if the temperature is adopted from the same spectral type but other luminosity class (e.g., ‘from I_Teff’), or if the value is taken directly from a single study such as E03 (Evans & Howarth 2003) or T18 (Tabernero et al. 2018).
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