**Table 1:** Number of stars, light curves and age of the open clusters used in the present analysis.
Cluster	Stars	Light curves	Age (Myr)
IC 2602	31	38	25-35^a
IC 4665	10	10	30-70^b,b1
IC 2391	16	20	48-58^c
$\alpha$ Persei	72	134	60-75^d
Pleiades	57	97	110-120^d
Hyades	23	23	500-650^e
Field	55	539	ZAMS to 650^f

^a Patten et al. (1996a); ^b Giampapa et al. (1998); ^b1 Tschäpe & Rüdiger (2001); ^c Barrado y Navascués et al. (1999);
^d Basri & Martin (1999); ^e Lebreton et al. (2001); ^f stars from Zero Age Main Sequence to Hyades age.

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