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Table 1
Stellar parameters for the stars analyzed in the present paper.
| Parameters | HD 7199 | HD 7449 | HD 137388 | HD 204941 |
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| Spectral type | K0IV/V | F8V | K0/K1V | K1/K2V |
| V | 8.06 | 7.50 | 8.71 | 8.45 |
| B − V | 0.849 | 0.575 | 0.891 | 0.878 |
| Parallax [mas] | 27.87 ± 0.69 | 25.96 ± 0.77 | 26.01 ± 1.88 | 37.10 ± 1.26 |
| Distance [pc] | 36 ± 1 | 39 ± 1 | 38 ± 3 | 27 ± 1 |
| Mv | 5.29 | 4.57 | 5.79 | 6.30 |
| L [L⊙ ] | 0.70 | 1.21 | 0.46 | 0.31 |
| R [R⊙ ] | 0.96 | 1.01 | 0.82 | 0.72 |
| M [M⊙ ] | 0.89 | 1.05 | 0.86 | 0.74 |
| Teff [K] | 5386 ± 45 | 6024 ± 13 | 5240 ± 53 | 5056 ± 52 |
| log g | 4.34 ± 0.08 | 4.51 ± 0.03 | 4.42 ± 0.11 | 4.48 ± 0.09 |
| [Fe/H ] | 0.28 ± 0.03 | –0.11 ± 0.01 | 0.18 ± 0.03 | –0.19 ± 0.03 |
log( ) |
–4.95 | –4.85 | –4.90 | –4.94 |
| Δ(log()) |
0.31 | 0.06 | 0.22 | 0.13 |
| σ(log()) |
0.083 | 0.014 | 0.053 | 0.032 |
| Prot | 42.89 ± 4.66 | 13.30 ± 2.56 | 42.44 ± 4.96 | 43.6 ± 4.88 |
| Age [Gyr] | 6.79 ± 0.78 | 2.10 ± 0.24 | 6.45 ± 0.74 | 6.67 ± 0.77 |
Notes. The value log() refers to the mean value of the activity level, whereas Δ(log ()) and σ(log ()) give the amplitude and the rms of the activity index variation, respectively.
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