Mode identification of three pulsating subdwarf B stars via multiplets and period spacing
We present an analysis of three pulsating subdwarf B stars residing in short period binaries discovered by the Kepler spacecraft. We followed the analysis presented in Baran. Most of the peaks we detected were assigned to mode degrees and, in the case of the multiplet components, the azimuthal numbers. We confirmed the spin rates for all three stars to be tens of days rather than hours as the binary frequencies may suggest. Using the average period spacings of each object we produced an échelle diagram which shows a common feature at a period of nearly 5000 s. The period spacing between consecutive overtones is quite regular, which confirms that the mode trapping is not significant as previously predicted by the models.
Physics, Astronomy, and Materials Science
Stars: oscillations (including pulsations): Asteroseismology, Subdwarfs
Baran, A. S., and A. Winans. "Mode Identification of Three Pulsating Subdwarf B Stars via Multiplets and Period Spacing." Acta Astronomica 62, no. 4 (2012): 343-55.