Third Body Problem in the Eclipsing Binary Star TV Cassiopeia

The aim of this work is to search for some evidences for the presence of unseen companion(s) in the eclipsing binary star TV Cassiopeia using its O—C diagram. Assuming that the light-time effect is responsible for the periodic components on the O—C diagram, the set of orbital parameters were derived using Irwin's (1959) method. The resulting orbital parameters and mass of the hypothetical third body are physically acceptable. Lacking other proofs of the third body presence, however, the hypothesis can be treated as a probable case only.This revised version was published online in October 2005 with corrections to the Cover Date.