Table 2: Photometry and membership for the observed sample stars in the $\lambda $ Ori cluster.

ID		 Namea RAb Decb Ic R-I c Ref.c Jb $H-K_{\rm s}^{b}$ SpTd $v_{\rm r}$ $v~ \sin~(i)$ Li pEWe Membership Notes
    (J2000)             (km s-1) (km s-1) (mÅ) $v_{\rm r}$ Li H$\alpha $ Tot  
L01 LOri-003 5 35 55.43 9 56 30.9 12.65 0.74 2 11.42 0.21 K8.5 ?   $520\pm32$ ? Y Y Y? SB
L02 DM009 5 34 32.83 9 59 30.9 12.94 0.78 1 11.84 0.17 K4.5 $27.09\pm0.26$ 18.9 +2.7-1.9 $464\pm23$ Y Y Y Y  
L03 LOri-016 5 35 13.46 9 55 25.3 13.18 0.89 2 11.96 0.23 K8.0 ?   $531\pm33$ ? Y Y Y? SB
L04 DM014 5 34 39.21 9 52 55.3 13.30 1.06 1 12.07 0.17 K7.0 $27.72\pm0.18$ <17.0 $523\pm26$ Y Y Y Y  
L05 LOri-020 5 34 57.57 9 46 07.2 13.31 1.34 2 11.86 0.19 M2.0 $21.43\pm0.53$   $18\pm29$ N N Y N  
L06 LOri-022 5 35 51.34 9 55 11.2 13.38 1.03 2 12.10 0.25 M1.5 $28.40\pm0.38$ <17.0 $516\pm33$ Y Y Y Y  
L07 LOri-024 5 34 57.12 9 54 36.7 13.45 0.98 2 12.14 0.23 M0.0 $27.28\pm0.29$ <17.0 $554\pm21$ Y Y Y Y  
L08 LOri-026 5 34 36.23 9 53 44.2 13.47 1.10 2 12.05 0.23 K9.5 $27.29\pm0.43$ 26.0 +6.0-1.0 $581\pm43$ Y Y Y Y  
L09 DM019 5 34 48.46 9 57 15.7 13.73 1.20 1 12.42 0.18 M0.5 $27.47\pm0.28$ <17.0 $571\pm27$ Y Y Y Y  
L10 LOri-030 5 35 12.54 9 55 19.5 13.74 1.21 2 12.43 0.26 M1.5 ?   Y ? Y Y Y? SB2
L11 LOri-034 5 35 19.92 10 02 36.5 13.97 1.13 2 12.44 0.46 M1.0 $24.36\pm0.30$ <17.0 $541\pm35$ N Y Y Y?  
L12 LOri-035 5 35 15.14 10 01 06.8 13.97 1.28 2 12.55 0.23 M2.5 $21.36\pm0.72$ 30.2 +10.0-6.2 $572\pm21$ N Y Y Y?  
L13 LOri-036 5 34 39.29 10 01 28.7 13.98 1.49 2 12.58 0.23 M3.0 $24.63\pm0.38$   $56\pm22$ N N Y N  
L14 LOri-037 5 34 35.61 9 59 43.3 13.99 1.18 2 12.46 0.24 M2.0 $27.13\pm0.33$ <17.0 $566\pm57$ Y Y Y Y  
L15 LOri-040 5 35 39.48 9 50 32.8 14.06 1.32 2 12.55 0.29 M3.0 $26.95\pm0.46$ <21.3 $561\pm45$ Y Y Y Y  
L16 LOri-041 5 35 30.45 9 50 34.1 14.10 1.45 2 12.50 0.27 M3.5 $27.05\pm0.71$ $\rm 61.9^{+11.8}_{-5.7}$ $485\pm40$ Y Y Y Y  
L17 DM030 5 35 17.17 9 51 11.4 14.13 1.46 1 12.80 0.22 M1.0 $27.30\pm0.27$ <17.0 $571\pm34$ Y Y Y Y  
L18 LOri-045 5 35 07.42 9 58 22.4 14.23 1.33 2 12.77 0.26 M2.0 $26.89\pm0.42$ <17.0 $554\pm23$ Y Y Y Y  
L19 LOri-046 5 34 26.08 9 51 49.4 14.36 1.28 2 13.03 0.23 M2.0 $-0.28\pm0.43$   $148\pm64$ N N N N  
L20 LOri-048 5 35 12.56 9 53 11.1 14.41 1.37 2 12.89 0.27 M2.5 $27.04\pm0.44$ <17.0 $545\pm12$ Y Y Y Y  
L21 LOri-049 5 35 01.00 9 49 36.1 14.50 1.27 2 13.17 0.34 M2.0 $24.06\pm0.36$   $64\pm13$ N N N N  
L22 LOri-050 5 34 56.40 9 55 04.6 14.54 1.36 2 12.88 0.29 M2.5 ?   $596\pm58$ ? Y Y Y? SB
L23 DM032 5 35 18.38 10 02 38.4 14.69 1.56 1 13.07 0.26 M1.5 $26.98\pm0.34$ <17.0 $589\pm16$ Y Y Y Y  
L24 LOri-053 5 34 36.73 9 52 58.3 14.72 1.36 2 13.17 0.24 M2.5 $27.00\pm0.42$ <18.3 $561\pm30$ Y Y Y Y  
L25 LOri-055 5 35 21.43 9 49 56.6 14.76 1.36 2 13.18 0.23 M2.5 $26.70\pm0.39$ <17.0 $602\pm33$ Y Y Y Y  
L26 LOri-056 5 34 58.37 9 53 47.1 14.87 1.56 2 13.21 0.30 M3.0 $26.84\pm0.56$ <19.3 $576\pm23$ Y Y Y Y  
L27 LOri-057 5 35 11.32 10 00 50.2 15.04 1.59 2 13.41 0.28 M3.5 $26.99\pm0.49$ <17.0 $677\pm19$ Y Y Y Y  
L28 LOri-060 5 35 20.00 9 49 06.2 15.14 1.42 2 13.60 0.30 M2.5 $27.22\pm0.45$ <18.5 $599\pm28$ Y Y Y Y  
L29 LOri-061 5 35 18.18 9 52 24.2 15.15 1.43 2 13.53 0.31 M2.5 $26.80\pm0.47$ 17.9 +1.4-1.8 $591\pm30$ Y Y Y Y  
L30 LOri-062 5 35 15.33 9 48 37.0 15.16 1.46 2 13.63 0.28 M3.0 $26.80\pm0.47$ <17.0 $648\pm48$ Y Y Y Y  
L31 LOri-068 5 34 48.02 9 43 26.2 15.20 1.56 2 13.52 0.27 M3.0 $29.37\pm0.47$ <17.0 $698\pm25$ N Y Y Y?  
L32 LOri-069 5 34 43.97 9 48 35.6 15.20 1.69 2 13.38 0.34 M3.5 ?   $516\pm57$ ? Y Y Y? SB
L33 LOri-075 5 34 55.22 10 00 34.7 15.23 1.72 2 13.40 0.26 M5.0* $26.02\pm0.82$ 61.3 +11.5-4.9 $455\pm44$ Y Y Y Y  
L34 LOri-063 5 35 19.14 9 54 42.4 15.34 1.46 2 13.76 0.41 M3.0 $27.19\pm0.47$ <18.2 $505\pm52$ Y Y Y Y  
L35 LOri-076 5 35 10.96 9 57 43.8 15.81 1.58 2 14.22 0.33 M3.0 $27.52\pm0.50$ <17.0 $608\pm19$ Y Y Y Y  
L36 LOri-079 5 34 48.26 9 59 53.9 16.00 1.51 2 14.22 0.20 M3.0 $27.03\pm0.51$ <17.0 $607\pm59$ Y Y Y Y  
L37 LOri-080 5 35 30.05 9 59 25.5 16.01 1.50 2 13.80 0.31 M3.0 $25.74\pm0.81$ 60.2 +21.3-5.9 $523\pm20$ Y Y Y Y  
L38 LOri-083 5 35 43.41 9 54 26.8 16.02 1.54 2 14.27 0.26 M3.0 $26.32\pm0.57$ 19.1 +7.9-2.6 $585\pm77$ Y Y Y Y  
L39 LOri-087 5 34 33.77 9 55 34.2 16.09 1.45 2 14.19 0.32 M4.5* $27.25\pm0.57$ 18.4 +6.0-1.7 $609\pm42$ Y Y Y Y  
L40 LOri-088 5 34 49.50 9 58 46.8 16.10 1.68 2 14.14 0.31 M3.5 $26.75\pm0.53$ <17.0 $660\pm42$ Y Y Y Y  
L41 LOri-092 5 35 50.97 9 51 03.5 16.19 1.65 2 14.44 0.30 M3.5 $26.66\pm0.57$ 19.8 +2.8-2.6 $661\pm53$ Y Y Y Y  
L42 LOri-093 5 34 41.20 9 50 16.3 16.21 1.61 2 14.46 0.24 M3.5 $27.00\pm0.56$ <18.3 $623\pm61$ Y Y Y Y  
L43 LOri-094 5 34 43.17 10 01 59.8 16.28 1.75 2 14.40 0.37 M4.0 $26.36\pm0.80$ 54.8 +5.5-8.2 $538\pm204$ Y Y Y Y  
L44 LOri-095 5 35 24.18 9 55 15.4 16.35 1.61 2 14.56 0.30 M6.0* $27.31\pm0.55$ <19.7 $559\pm30$ Y Y Y Y  
L45 LOri-096 5 35 11.13 9 57 19.6 16.37 1.65 2 14.63 0.33 M3.5 $26.92\pm0.55$ <19.1 $553\pm48$ Y Y Y Y  
L46 LOri-100 5 35 00.10 9 46 14.0 16.43 1.65 2 14.77 0.22 M3.5 $28.04\pm0.46$ <17.0 $717\pm43$ Y Y Y Y  
L47 LOri-102 5 35 22.02 9 52 52.3 16.50 1.74 2 14.63 0.27 M4.0 $28.10\pm0.53$ <17.0 $584\pm62$ Y Y Y Y  
L48 LOri-105 5 34 17.58 9 52 29.7 16.75 1.83 2 14.92 0.35 M4.0 $26.45\pm0.70$ <20.0 Y Y Y Y Y  
L49 LOri-106 5 35 28.77 9 54 10.2 16.76 1.72 2 14.78 0.42 M4.0 $26.83\pm0.54$ <17.0 $636\pm132$ Y Y Y Y  
a Star names are from the following sources: DM =  Dolan & Mathieu (1999); LOri = Barrado y Navascués et al. (2004); b coordinates and infrared photometry are from the 2MASS catalogue; c optical photometric data are taken from: (1) Dolan & Mathieu (1999), (2) Barrado y Navascués et al. (2004); d spectral types marked with asterisk have been derived spectroscopically by Barrado y Navascués et al. (2004). The other spectral types have been derived from photometry (see Sect. 2.1); e for the double-lined spectroscopic binary L10 and for the star L48, we only indicate whether the line is identified (Y) or not (N).


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