Parameters and Pulsation Constant of Cepheid

The analysis of fifty empirical period-radius relations and forty-three period-luminosity is performed for the Cepheids. It found that most these have significant systematic errors. A new metrological method suggested to exclude errors using temperature scale various samples In this regard, reliable between mass, radius, effective surface temperature, luminosity, absolute magnitude on one hand, pulsation period other as well dependence radius mass are determined Cepheids types δ Cephei Scuti from Galaxy. These permit us accurately determine value constant both first time. very weakly depends Cepheid, contrary known theoretical calculation. Hence, pulsate almost a unified whole homogeneous spherical body in wide ranges star’s evolutionary state with an extremely inhomogeneous distribution stellar substance over its volume. Therefore, it Cepheid is, all, homogenous shell gravitational mass. This triggered by well-known effects; example, local optical opacity overshooting, usual substance.