U,B,V LIGHT CURVES OF THE SHORT-PERIOD SOLAR-TYPE ECLIPSING BINARY, V417 AQUILAE

A complete photometric analysis of U,B,V photometry for the short-peri od solar-type V417 Aquilae is presented. Seven epochs of minimum light were determined from our observations covering two primary and five s econdary eclipses. A period study covering some 58 000 orbital cycles reveals two distinct eras of constant period connected by what may be a smooth transition. The periods determined for the two eras are nearl y the same, differing by approximate to 0.16 s. During the intervening 23 years, a 0.1d jump in residuals takes place. The light curves show that V417 Aql is a W-type W UMa system with a 25 min time of constant light in the primary minimum. The light curves are fairly symmetrical . A simultaneous three-color solution was computed using the Wilson sy nthetic light-curve code. Our photometry in conjunction with the solut ion reveal that V417 Aql consists of G0 V and F9 V spectral type compo nents in contact with a 19% fill-out and a mass ratio of 0.37. Its nea rly equal eclipse depths, the low mass ratio, and the moderate fill-ou t suggest that V417 Aql may be evolving into an A-type W UMa binary. ( C) 1997 American Astronomical Society.