Table 2: Number of Hipparcos ( $H_{\rm P}$ ) and Tycho ( $B_{\rm T}$ , $V_{\rm T}$ ) photometric data and ground based radial velocity observations, their mean S/N and standard error for the three programme stars. Error for radial velocity is in km s^-1.
Hip Tyc RV

N $\sigma$ ( $H_{\rm P}$ ) N $\sigma$ ( $B_{\rm T}$ ) $\sigma$ ( $V_{\rm T}$ ) N S/N $\sigma$ ( RV)

V781 Tau 61 0.014 81 0.18 0.15 41 35 8

UV Leo 96 0.015 150 0.21 0.17 29 30 10

GK Dra 124 0.017 179 0.15 0.15 35 45 3

**Table 2:** Number of Hipparcos ( $H_{\rm P}$ ) and Tycho ( $B_{\rm T}$ , $V_{\rm T}$ ) photometric data and ground based radial velocity observations, their mean S/N and standard error for the three programme stars. Error for radial velocity is in km s^-1.
	Hip		Tyc		RV
	N	$\sigma$ ( $H_{\rm P}$ )		N	$\sigma$ ( $B_{\rm T}$ )	$\sigma$ ( $V_{\rm T}$ )	N	S/N	$\sigma$ ( RV)
V781 Tau	61	0.014		81	0.18	0.15	41	35	8
UV Leo	96	0.015		150	0.21	0.17	29	30	10
GK Dra	124	0.017		179	0.15	0.15	35	45	3

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