2004NewA....9..239B

The semi-detached eclipsing binary system CF Puppis (P=7.65 days) has been analysed using the Wilson-Devinney program. Light curves have been obtained in the Geneva 7-colour photometric system, and radial velocity curves for both components have been measured with the cross-correlation technique. The physical and orbital parameters have been determined through a self-consistent simultaneous solution of light curves in seven colours and of the radial velocity curves of both components. The absolute elements of the components are, for the primary (mass gainer), M1=1.84±0.04 M, R1=3.06±0.01 R, Mbol1=1.74±0.02, Teff1=6671±27 K, and for the secondary (mass loser), M2=0.38±0.01 M, R2=5.39 R, Mbol2=2.51±0.02, Teff2=4202±17 K. The semi-major axis A of the relative orbit is 21.28±0.15 R. The estimated spectral types of the components are about F3 IV (primary) and K2/3 III. CF Pup has one of the coolest component A among the Algol systems. The equatorial rotationalvel! ocities are 24.8 (primary) and 37.0 km s-1. The secondary is clearly synchronized, and the primary is nearly synchronized (vsyn=20.2 km s-1). The distance to CF Pup is evaluated to 506±16 pc, and the colour excess E[B2-V1] to 0.033±0.017.