If the pulsation is radial, it occurs symmetrically over the whole surface so that star remains spherical. This is the case with most giant and supergiant pulsating variables, including Cepheid variables, RR Lyrae stars, RV Tauri stars, and Mira stars.
If the pulsation is non-radial, as for example with ZZ Ceti stars, waves run in all directions over the star's surface giving rise to multiple periods and a complex patterns of nodes and antinodes.
Related entry• variable stars
Related categories• TYPES OF STARS
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