Table 2: Fundamental stellar parameters for our sample stars as determined by Decin (2000). The effective temperature $T_{{\rm eff}}$ is given in K, the logarithm of the gravity in cgs units, the microturbulent velocity  $\xi _{\rm t}$ in km s-1, the angular diameter in mas, the parallax $\pi $ in mas, the distance D in parsec, the radius R in $R_{\odot }$, the gravity-induced mass $M_{\rm g}$ in $M_{\odot }$ and the luminosity L in $L_{\odot }$. PP denotes a plane-parallel geometry, SPH a spherical geometry.
  $\alpha $ CMa $\alpha $ Car $\alpha $ Cen A $\alpha $ Boo $\beta $ UMi
Sp. type A1 V F0 II G2 V K2 IIIp K4 III
$T_{{\rm eff}}$ $10150 \pm 400$ $7350 \pm 300$ $5830 \pm 30$ $4300 \pm 70$ $4150 \pm 70$
$\log~g$ $4.30 \pm 0.20$ $1.80 \pm 0.50$ $4.35 \pm 0.05$ $1.50 \pm 0.15$ $1.90 \pm 0.15$
$\xi _{\rm t}$ $2.0 \pm 0.5$ 2.0 $1.0 \pm 0.1 $ $1.7 \pm 0.5$ $2.0 \pm 0.5$
${\rm [Fe/H]}$ $0.50 \pm 0.30$ $-0.25 \pm 0.05$ $0.25 \pm 0.02$ $-0.50 \pm 0.20$ $-0.15 \pm 0.20$
$\varepsilon $(C) $7.97 \pm 0.15$ $8.41 \pm 0.10$ $8.74 \pm 0.05$ $7.96 \pm 0.15$ $8.40 \pm 0.20$
$\varepsilon $(N) $8.15 \pm 0.15$ $8.68 \pm 0.05$ $8.26 \pm 0.09$ $7.55 \pm 0.15$ $8.16 \pm 0.20$
$\varepsilon $(O) $8.55 \pm 0.12$ $8.91 \pm 0.10$ $9.13 \pm 0.06$ $8.67 \pm 0.15$ $8.83 \pm 0.15$
${\rm ^{12}C/^{13}C}$ 89 89 89 $7 \pm 1$ $9 \pm 1$
$\theta_{\rm d}$ $6.17 \pm 0.27$ $7.22 \pm 0.30$ $8.80 \pm 0.34$ $20.80 \pm 0.83$ $9.86 \pm 0.40$
$\pi $ $379.21 \pm 1.58$ $10.43 \pm 0.53$ $737 \pm 2.6$ $88.85 \pm 0.74$ $25.79 \pm 0.52$
D $2.63 \pm 0.01$ $95.88 \pm 4.87$ $1.36 \pm 0.01$ $11.26 \pm 0.09$ $38.78 \pm 0.78$
R $1.75 \pm 0.08$ $74.39 \pm 4.89$ $1.27 \pm 0.05$ $25.24 \pm 1.03$ $41.09 \pm 1.87$
$M_{\rm g}$ $2.23 \pm 1.05$ (PP) $12.8 \pm 6.13$ (PP) $1.30 \pm 0.46$ (PP) $0.74 \pm 0.26$ (SPH) $4.90 \pm 1.90$ (SPH)
L $29 \pm 4$ $14571 \pm 497$ $1.7 \pm 0.2$ $196 \pm 21$ $452 \pm 48$
  $\gamma$ Dra $\alpha $ Tau $\beta $ And $\alpha $ Cet $\beta $ Peg
Sp. type K5 III K5 III M0 III M2 III M2.5 III
$T_{{\rm eff}}$ $3930 \pm 70$ $3850 \pm 70$ $3780 \pm 70$ $3745 \pm 70$ $3590 \pm 150$
$\log~g$ $1.55 \pm 0.25$ $1.50 \pm 0.15$ $1.40 \pm 0.20$ $1.30 \pm 0.15$ $1.50 \pm 0.40$
$\xi _{\rm t}$ $2.0 \pm 0.5$ $1.7 \pm 0.3$ $2.3 \pm 0.5 $ $2.3 \pm 0.5 $ $2.3 \pm 0.5 $
${\rm [Fe/H]}$ $0.00 \pm 0.20$ $-0.15 \pm 0.20$ $0.00 \pm 0.20$ $0.00 \pm 0.20$ $0.00 \pm 0.30$
$\varepsilon $(C) $8.22 \pm 0.20$ $8.35 \pm 0.20$ $8.20 \pm 0.20$ $8.40 \pm 0.20$ $8.56 \pm 0.30$
$\varepsilon $(N) $8.26 \pm 0.20$ $8.35 \pm 0.20$ $8.37 \pm 0.20$ $8.26 \pm 0.20$ $8.24 \pm 0.30$
$\varepsilon $(O) $8.81 \pm 0.15$ $8.83 \pm 0.15$ $8.84 \pm 0.15$ $8.93 \pm 0.15$ $9.03 \pm 0.30$
${\rm ^{12}C/^{13}C}$ $10 \pm 1$ $10 \pm 1$ $9 \pm 1$ $10 \pm 1$ $7 \pm 1$
$\theta_{\rm d}$ $10.07 \pm 0.40$ $20.77 \pm 0.83$ $13.59 \pm 0.55$ $12.52 \pm 0.50$ $16.88 \pm 0.70$
$\pi $ $22.10 \pm 0.46$ $50.09 \pm 0.95$ $16.36 \pm 0.76$ $14.82 \pm 0.83$ $16.37 \pm 0.72$
D $45.25 \pm 0.94$ $19.96 \pm 0.38$ $61.12 \pm 2.84$ $67.48 \pm 3.78$ $61.08 \pm 2.69$
R $48.97 \pm 2.21$ $44.63 \pm 1.97$ $89.27 \pm 5.50$ $90.86 \pm 6.25$ $110.52 \pm 6.69$
$M_{\rm g}$ $3.11 \pm 1.50$ (SPH) $2.30 \pm 0.82$ (SPH) $7.32 \pm 3.48$ (SPH) $6.02 \pm 2.89$ (SPH) $14.12 \pm 6.73$ (SPH)
L $516 \pm 59$ $395 \pm 45$ $1468 \pm 211$ $1465 \pm 229$ $1830 \pm 300$


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