Table 1: Observed and inferred parameters of HD 4308. Photometric and astrometric parameters were taken from the Hipparcos catalogue (ESA 1997). The other stellar physical quantities were obtained from a high-resolution ETL spectral analysis or were interpolated in the grid of Geneva evolution models (Schaerer et al. 1993).
Parameter HD 4308

Sp G5V

V [mag] 6.54

B-V [mag] 0.65

$\pi$ [mas] 45.76

M_V [mag] 4.85

$T_{{\rm eff}}$ [K] 5685 $\pm$ 13

log g [cgs] 4.49 $\pm$ 0.07

${\rm [Fe/H]}$ [dex] -0.31 $\pm$ 0.01

L [ $L_{\odot}$ ] 0.99

M_* [ $M_{\odot}$ ] 0.83 $\pm$ 0.01

$v\sin{i}$ [km s^-1] 1.2

$\log R'_{{\rm HK}}$ -4.93

$P_{{\rm rot}}$ ( $\log R'_{{\rm HK}}$ ) [days] 24

age (model/ $\log R'_{{\rm HK}}$ ) [Gyr] >10 / 4.3

**Table 1:** Observed and inferred parameters of HD 4308. Photometric and astrometric parameters were taken from the Hipparcos catalogue (ESA 1997). The other stellar physical quantities were obtained from a high-resolution ETL spectral analysis or were interpolated in the grid of Geneva evolution models (Schaerer et al. 1993).
Parameter		HD 4308
Sp			G5V
V	[mag]		6.54
B-V	[mag]		0.65
$\pi$	[mas]		45.76
M_V	[mag]		4.85
$T_{{\rm eff}}$	[K]		5685 $\pm$ 13
log g	[cgs]		4.49 $\pm$ 0.07
${\rm [Fe/H]}$	[dex]		-0.31 $\pm$ 0.01
L	[ $L_{\odot}$ ]		0.99
M_*	[ $M_{\odot}$ ]		0.83 $\pm$ 0.01
$v\sin{i}$	[km s^-1]		1.2
$\log R'_{{\rm HK}}$			-4.93
$P_{{\rm rot}}$ ( $\log R'_{{\rm HK}}$ )	[days]		24
age (model/ $\log R'_{{\rm HK}}$ )	[Gyr]		>10 / 4.3

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