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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

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