Table 2
Stellar parameters of HD 238090, GJ 251, and Lalande 21185.
| Parameter | GJ 251 | HD 238090 | Lalande 21185 | Ref. (GJ 251/HD 238090/Lalande 21185) |
|---|---|---|---|---|
| Identifiers | ||||
| Gliese-Jahreiß | GJ 251 | GJ 458 A | GJ 411 | Gli79 |
| Karmn | J06548 + 332 | J12123 + 544S | J11033 + 359 | Cab16 |
| Coordinates and spectral type | ||||
| Epoch | J2015.5 | J2015.5 | J2000.0 | Gaia DR2/Gaia DR2/vLe07 |
| α | 06 54 48.06 | 12 12 21.27 | 11 03 20.19 | Gaia DR2/Gaia DR2/vLe07 |
| δ | + 33 15 59.3 | + 54 29 10.2 | + 35 58 11.6 | Gaia DR2/Gaia DR2/vLe07 |
| Sp. type | M3.0 V | M0.0 V | M1.5 V | Alo15/PMSU/Alo15 |
| G (mag) | 8.8552 ± 0.0011 | 9.0379 ± 0.0005 | … | Gaia DR2 |
| J (mag) | 6.10 ± 0.02 | 6.88 ± 0.02 | 4.20 ± 0.24 | 2MASS |
| Parallax and kinematics | ||||
| μα cosδ (mas yr−1) | − 726.39 ± 0.13 | + 232.38 ± 0.04 | − 580.27 ± 0.62 | Gaia DR2/Gaia DR2/vLe07 |
| μδ (mas yr−1) | − 398.13 ± 0.12 | + 92.09 ± 0.04 | − 4765.85 ± 0.64 | Gaia DR2/Gaia DR2/vLe07 |
| π (mas) | 179.16 ± 0.06 | 65.61 ± 0.03 | 392.64 ± 0.67 | Gaia DR2/Gaia DR2/vLe07 |
| d (pc) | 5.581 ± 0.002 | 15.24 ± 0.01 | 2.547 ± 0.004 | Gaia DR2/Gaia DR2/vLe07 |
| γ (km s−1) | 22.654 ± 0.025 | − 17.668 ± 0.018 | − 85.016 ± 0.023 | Laf19 |
| U (km s−1) | − 27.41 ± 0.02 | 18.08 ± 0.01 | 46.29 ± 0.03 | This work |
| V (km s−1) | − 3.67 ± 0.01 | 7.41 ± 0.01 | − 53.68 ± 0.09 | This work |
| W (km s−1) | − 15.13 ± 0.01 | − 16.01 ± 0.02 | − 74.59 ± 0.02 | This work |
| Photospheric parameters | ||||
| Teff (K) | 3451 ± 51 | 3933 ± 51 | 3601 ± 51 | Sch19 |
| logg (dex) | 4.96 ± 0.07 | 4.70 ± 0.07 | 4.87 ± 0.07 | Sch19 |
| [Fe∕H] (dex) | − 0.03 ± 0.16 | − 0.03 ± 0.16 | − 0.09 ± 0.16 | Sch19 |
| Physical parameters | ||||
| L (L⊙) | 0.0169 ± 0.0003 | 0.0702 ± 0.0015 | 0.0195 ± 0.0013 | Sch19 |
| R (R⊙) | 0.364 ± 0.011 | 0.570 ± 0.016 | 0.392 ± 0.004 | Sch19/Sch19/Boy12 |
| M (M⊙) | 0.360 ± 0.015 | 0.578 ± 0.021 | 0.390 ± 0.011 | Sch19/Sch19/This work |
| Activity parameters | ||||
| pEW (Hα) (Å) | 0.00 ± 0.01 | + 0.04 ± 0.01 | − 0.04 ± 0.01 | Schf19 |
| v sin i (km s−1) | < 2 | <2 | <2 | Rei18 |
| Prot (d) |  |
 |
56.15 ± 0.27 | This work/This work/Dia19 |
References. 2MASS: Skrutskie et al. (2006); Alo15: Alonso-Floriano et al. (2015); Cab16: Caballero et al. (2016a); Gli79: Gliese & Jahreiß (1979); Gaia DR2: Gaia Collaboration (2018); PMSU: Hawley et al. (1996); Sch19: Schweitzer et al. (2019); vLe07: van Leeuwen (2007); Boy12: Boyajian et al. (2012); Dia19: Díaz et al. (2019); Schf19: Schöfer et al. (2019); Laf19: Lafarga et al. (2020).
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