Table 5: Parameters of the secondary star in EX Hya compared with those of Gl551 (Proxima Cen).
Parameter EX Hya B Gl551¹

Spectral type
dM $5.5\pm 0.5$ dM5.5

Temperature $T_{\rm eff}$ (K) $3042\pm117$

Distance d (pc) $64.5\pm 1.2$ $1.295\pm 0.007$

K (mag) $12.89\pm0.11$ 4.36

$M_{\rm K}$ (mag) $8.83\pm 0.12$ $8.80\pm 0.02$

Mass M ( $M_\odot$ ) $0.108\pm 0.008$ $0.123\pm 0.006$

Radius R ( $R_\odot$ ) $0.1516\pm 0.0034$ $0.145\pm 0.011$

Velocity amplitude K₂ (km s^-1) $432.4\pm 4.8$

Systemic velocity $\gamma$ (km s^-1) $-58.2\pm1.0$

**Table 5:** Parameters of the secondary star in EX Hya compared with those of Gl551 (Proxima Cen).
Parameter	EX Hya B	Gl551¹
Spectral type	dM $5.5\pm 0.5$	dM5.5
Temperature $T_{\rm eff}$ (K)		$3042\pm117$
Distance d (pc)	$64.5\pm 1.2$	$1.295\pm 0.007$
K (mag)	$12.89\pm0.11$	4.36
$M_{\rm K}$ (mag)	$8.83\pm 0.12$	$8.80\pm 0.02$
Mass M ( $M_\odot$ )	$0.108\pm 0.008$	$0.123\pm 0.006$
Radius R ( $R_\odot$ )	$0.1516\pm 0.0034$	$0.145\pm 0.011$
Velocity amplitude K₂ (km s^-1)	$432.4\pm 4.8$
Systemic velocity $\gamma$ (km s^-1)	$-58.2\pm1.0$

¹⁾ From Ségransan et al. (2003).

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