We analyze the linearized operator for nonradial oscillations of spherically symmetric self-gravitating gaseous stars in view functional analysis. The evolution star is supposed to be governed by Euler–Poisson equations under equation state ideal gas, and motion adiabatic. consider case not necessarily isentropic, that is, barotropic motions. Basic theory self-adjoint realization established. S...

Related DatabasesWeb of Science You must be logged in with an active subscription to view this.Article DataHistorySubmitted: 30 November 2020Accepted: 10 May 2021Published online: 26 August 2021Keywordsinhomogeneous nonlinear Schrödinger equation, global existence, scattering, blow-upAMS Subject Headings35Q55, 35B44Publication DataISSN (print): 0036-1410ISSN (online): 1095-7154Publisher: Societ...

The results obtained by means of the photometric approach to the study of δ Sct stars are extensively discussed. The different frequency contents of the three best candidates for asteroseismological studies (FG Vir, 4 CVn and XX Pyx) are presented and compared; the importance of the amplitude variations and of the combination terms is emphasized. The analysis of other multiperiodic variables sh...

A survey for line profile variability in early A-type stars has been performed in order to detect nonradial pulsation signatures. The star HR 6139, with spectral type A2V and estimated T eff = 8800 K, shows evident line profile variations that can be explained by oscillations in prograde g-modes. This feature and the known photometric variability are similar to those observed in the Slowly Puls...

This paper deals with classical solution of system $ \begin{array}{*{20}{l}}{\begin{eqnarray} { } \left\{ \begin{array}{ll} u_t = \epsilon_1\Delta u-\chi_{1}\nabla\cdot(u\nabla v)-\chi_{2}\nabla\cdot(u\nabla z)+\mu_1 u(1-u-a_1w), &\\ 0 \Delta v-v+w^{\sigma_1}, w_t \epsilon_2\Delta w-\chi_3\nabla\cdot(w\nabla z)-\chi_4\nabla\cdot(w\nabla v)+\mu_2 w(1-w-a_2u), z-z+u^{\sigma_2} & \end{arra...