Internal dynamics from asteroseismology for two sdB pulsators in close binary systems

摘要: Since their discovery eleven years ago, short-period pulsating sdB stars have proved potential for quantitative asteroseismological studies. We recently updated our astero- seismic diagnostic tools in order to incorporate the effects of stellar rotation on pulsations, assuming various internal laws. It is possible, with these new tools, determine profile two residing close binary systems, namely Feige 48 and PG 1336 ‑018. They exhibit orbital periods 9.024 h 2.424 respectively, as measured from spectroscopy. For stars, we show that spin-orbit synchronism reached surface down ˜ 0.22 R∗ 0.55 RxE2x88x97 , respectively. The deeper layers cannot be inferred type modes p-modes observed stars. These results can potentially provide elements test tidal friction theories, particularly angular momentum transport, systems.