Abstract
This paper presents complete uvby light curves for the recently discovered eclipsing binary system V2154 Cyg. Additional Crawford H data were also obtained. Three times of primary minima and two secondary minima are determined. An improved orbital period is found to be 2: 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 dierent in size. Masses of about M1 =1 :4 M and M2 =0 :8 M 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, leading to a minimum orbital period of about 140 yr for the visual pair.
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