Table 1:

Photometric data for EW Ori and the comparison stars.

Object	Sp. type	Ref.	V		b-y		m1		c1		N()			N()
EW Ori	G0 Va	C10	9.902	7	0.390	5	0.186	8	0.364	10	324	2.613	8	25
		C10	10.510	7	0.379	5	0.181	4	0.369	4	4
		HH75	9.905	7	0.387	5	0.201	1	0.350	10	2
		L02	9.924		0.407		0.175		0.353		1	2.629		1
HD 34658	F3 III/IVb	C10	5.334	5	0.258	3	0.196	5	0.668	6	180	2.691	4	15
		SP65			0.268		0.177		0.682		2
		C66										2.685		7
		GO7677	5.334	2	0.260	2	0.189	3	0.671	5	4	2.685	6	3
		AF90	5.326	12	0.263	20	0.184	18	0.659	23	2	2.676	3	2
HD 34745	F7 Vb	C10	6.999	6	0.343	4	0.171	7	0.363	8	236	2.618	8	17
		O83	6.998	6	0.351	1	0.168	5	0.360	1	2
		O94	7.008	4	0.350	3	0.157	4	0.367	5	1	2.614	6	1
HD 35638	F5 Vb	C10	7.645	6	0.290	4	0.164	7	0.420	8	172	2.651	8	16
		O83	7.648	5	0.297	3	0.158	2	0.417	1	2
		O94	7.653	5	0.295	3	0.151	4	0.430	6	1	2.648	6	1

Notes. For EW Ori, the information by C10 (first line), HH75, and L02 is the mean value outside eclipses. For C10 (second line) indices during the total part of secondary eclipse are included.
N is the total number of observations used to form the mean values, and  is the rms error (per observation) in mmag.
^(a) Popper et al. (1986); spectral type of the primary component; ^(b) Houk & Swift (1999).

References. AF90 = Arellano Ferro et al. (1990), C10 = this paper, C66 = Crawford et al. (1966), GO7677 = Grønbech & Olsen (1976, 1977) (revised catalogue), HH75 = Hilditch & Hill (1975), L02 = Lacy (2002), O83 = Olsen (1983), O94 = : Olsen (1994), : Olsen (unpublished), SP65 = Strömgren & Perry (1965).