Table 1
Stellar parameters of GJ 338 binary system.
| Parameters | GJ 338 A | GJ 338 B | Ref. (a) |
|---|---|---|---|
| Other name | HD 79210 | HD 79211 | |
| Karmn | J09143+526 | J09144+526 | AF15a |
| α (J2000) | 09:14:22.78 | 09:14:24.68 | Gaia DR2 |
| δ (J2000) | +52:41:11.8 | +52:41:10.9 | Gaia DR2 |
| G (mag) | 6.9689 ± 0.0005 | 7.0477 ± 0.0004 | Gaia DR2 |
| J (mag) | 4.89 ± 0.04 | 4.779 ± 0.174 | 2MASS |
| Spectral type | M0.0 V | M0.0 V | AF15a |
| d (pc) | 6.334 ± 0.002 | 6.334 ± 0.002 | Gaia DR2 |
| μα cosδ (mas a−1) | − 1546.10 ± 0.06 | − 1573.12 ± 0.06 | Gaia DR2 |
| μδ (mas a−1) | − 569.13 ± 0.06 | − 660.12 ± 0.06 | Gaia DR2 |
| U (km s−1) | − 42.20 ± 0.36 | − 44.01 ± 0.36 | CC16 |
| V (km s−1) | − 14.99 ± 0.10 | − 17.44 ± 0.10 | CC16 |
| W (km s−1) | − 23.73 ± 0.34 | − 23.10 ± 0.34 | CC16 |
| Teff (K) | 4024 ± 51 | 4005 ± 51 | Schw19 |
| log g (cgs) | 4.68 ± 0.07 | 4.68 ± 0.07 | Schw19 |
| [Fe/H] (dex) | − 0.05 ± 0.16 | − 0.03 ± 0.16 | Schw19 |
| L (L⊙) | 0.0789 ± 0.0038 | 0.0792 ± 0.0031 | Schw19 |
| M (M⊙) | 0.69 ± 0.07 | 0.64 ± 0.07 | This work |
| 0.591 ± 0.047 | 0.596 ± 0.042 | Schw19 | |
| R (R⊙) | 0.58 ± 0.02 | 0.58 ± 0.03 | Schw19 |
| v sin i (km s−1) | 2.9 ± 1.2 | 2.3 ± 1.5 | GG05, Rein18 |
| Prot (d) |  |
16.61 ± 0.04 | This work |
| LX (1027 erg s−1) | 5.2 ± 0.3 | 5.0 ± 0.1 | This work |
 |
... | − 4.4 | MA10 |
| Age (Ga) | 1–7 | 1–7 | This work |
References. (a)Gaia DR2: Gaia Collaboration (2018); 2MASS: Skrutskie et al. (2006); AF15a: Alonso-Floriano et al. (2015); CC16: Cortés-Contreras (2016); GG05: Głȩbocki & Gnaciński (2005); Rein18: Reiners et al. (2018a); Schw19: Schweitzer et al. (2019); MA10: Martínez-Arnáiz et al. (2010).
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