slowly pulsating B stars
... that slowly pulsating B stars change in shape, not volume, as they pulsate?
... that <b id="mwCWc"><a class="mw-redirect" href="./Slowly_pulsating_B_star" id="mwCWg" rel="mw:WikiLink" title="Slowly pulsating B star">slowly pulsating B stars</a></b> change in shape, not volume, as they pulsate?