New orbital solutions and absolute elements of the eclipsing binary TV Cet

Abstract

Abstract We present new differential, four-color photoelectric photometry for the eclipsing binary TV Cet. UBVR light curves and radial velocities published previously are solved simultaneously using the Wilson–Devinney computer program. Our solutions indicate that TV Cet includes a third light contribution with 2.3% in U, 1.9% in B, 1.3% in V and 1.6% in R. The masses of the component stars are 1.34 ± 0.05 and 1.23 ± 0.05 M ⊙ , while the radii are 1.47 ± 0.02 and 1.21 ± 0.01 R ⊙ for the primary and secondary components, respectively. Using new absolute properties and our previous results from period analysis, we calculated the observational and theoretical internal structure constants to be k ¯ 2 , obs = - 1.66 and k ¯ 2 , theo = - 2.25 , respectively. Taking into account the third light contribution from the Wilson–Devinney solution and properties of the third body orbit from period analysis, the mass of the third body is obtained as 0.56 M ⊙ , corresponding to the inclination value i 3 = 20 ° . Evolutionary status of the component stars is also studied. We present the position of the stars in an H–R diagram for solar compositions.