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1 1998

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V879 Aql: a W UMa-type Eclipsing Binary System

Kopacki G., Pigulski A.

Acta Astronomica

1998

Vol. 48, No. 4

747--755

We present new CCD observations of V879 Aql. Our data clearly show that this star, hitherto classified as a δ Scuti variable, is in fact an eclipsing binary system of the W UMa type. From the photometric point of view it belongs to subclass A. Analysis of the light curves with the Wilson-Devinney program indicates contact geometry, total eclipse, and mass ratio equal to 1.97. The smaller secondary is slightly hotter than the primary and the temperature difference amounts to about 90 K. As a result of a transformation to the standard system, we obtained V magnitudes and (V-I) color indices for 211 stars in the field of V879 Aql. Among them we found two new red variables.