Table 5.
Optical and X-ray properties of classified Galactic M dwarfs in the filed of the Draco dSph.
| Src-No | r − i | i − z | z − J | Spectral type | Mi | dphot (pc) | dGaia (pc) | Mbol | Lx (erg s−1) | log |
|---|---|---|---|---|---|---|---|---|---|---|
| 3 | 0.92±0.01 | 0.52±0.02 | 1.21±0.08 | M2 | 8.8±0.1 | 506 | – | 8.6 | 8.5 × 1028 | –2.9 |
| 7 | 1.33±0.02 | 0.70±0.02 | 1.38±0.10 | M4 | 9.34±0.3 | 520 | 366±23 | 9.5 | 3.2 × 1029 | –2.1 |
| 9 | 1.15±0.01 | 0.64±0.01 | 1.28±0.06 | M3 | 8.8±0.3 | 413 | 497±20 | 8.2 | 1.4 × 1029 | –3.0 |
| 10 | 1.74±0.04 | 0.98±0.03 | 1.59±0.13 | M5 | 11.7±0.4 | 242 | 657±160 | 9.1 | 2.5 × 1029 | –2.5 |
| 12 | 1.40±0.02 | 0.78±0.02 | 1.51±0.05 | M4 | 10.0±0.3 | 351 | 446±28 | 8.7 | 2.0 × 1029 | –2.7 |
| 13 | 1.14±0.04 | 0.64±0.04 | 1.32±0.19 | M3 | 9.2±0.5 | 820 | – | 9.7 | 3.0 × 1029 | –2.4 |
| 14 | 1.45±0.01 | 0.80±0.01 | 1.44±0.04 | M4-M5 | 10.2±0.3 | 158 | 140±2 | 9.7 | 1.2 × 1028 | –3.3 |
| 15 | 1.15±0.01 | 0.62±0.01 | 1.37±0.06 | M3 | 9.1±0.1 | 375 | 510±70 | 8.3 | 2.3 × 1029 | –2.8 |
Notes. The spectral types of the M dwarfs are identified based on the optical and infrared colours (West et al. 2011). The table also presents the absolute magnitude (Mi), bolometric magnitude (Mbol), photometric distance (dphot), Gaia DR2 distance (dGaia), X-ray luminosity (LX) in the energy range of 0.2–5.0 keV, and X-ray to bolometric luminosity, log
, of M dwarfs.
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