uvby light curves of the eclipsing binary system V2154 Cyg

This paper presents complete uvby light curves for the recently discovered eclipsing binary system V2154 Cyg. Additional Crawford H-beta data were also obtained. Three times of primary minima and two secondary minima are determined. An improved orbital period is found to be 2.(d)6306312. A detailed photometric analysis is made using the EBOP code. This eclipsing binary is probably one of the components of a much wider double star, forming altogether a triple system. The results show that the eclipsing pair is a detached system with two late-type stars very different in size. Masses of about M-1 = 1.4 M-circle dot and M-2 = 0.8 M-circle dot are inferred for the components by using stellar evolution models. The total mass of the probable triple system is estimated to be of about 3.5 M-circle dot, leading to a minimum orbital period of about 140 yr for the visual pair.