Table 1: Observed stars. Columns headings are: Star - object name, V - V magnitude, E(B-V) - reddening, Sp - spectral and luminosity class.

Star	V	E(B-V)	Sp
BD+59 2735	9.88	1.38	B0Ib
BD+40 4220	9.05	1.99	O7e
HD 13256	8.68	1.38	B1Ia
HD 34078	5.94	0.50	O9.5Ve
HD 204827	8.0	1.08	B0V
HD 207538	7.3	0.58	B0V
BD+59 451	9.29	0.89	B1II
BD+59 456	9.86	0.79	B0.5V
BD+60 594	9.33	0.62	O9V
HD 15785	8.34	0.76	B1Iab
HD 46149	7.59	0.45	O8.5V
BD+58 2580	10.08	1.04	B0.5V
HD 210839	5.00	0.55	O6e
HD 219287	8.91	1.24	B0Ia
HD 226868	8.91	1.03	B0Ib
HD 228779	8.92	1.53	O9.5Ib
HD 235825	9.29	0.51	O9V
HD 186745	7.04	0.96	B8Ia
HD 206267	5.78	0.49	O6f
HD 228712	8.67	1.33	B0.5Ia