Other
Scientific paper
Mar 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aspc..452..185r&link_type=abstract
Fifth Meeting on Hot Subdwarf Stars and Related Objects, ASP Conference Series Vol. 452, proceedings of a workshop held at Stell
Other
Scientific paper
During the Kepler satellite's first year of operation, its short cadence observations were obtained in a survey mode where targets received one month of nearly continuous observations. 48 subdwarf B stars were observed of which 14 were found to be pulsators, with only one of these having predominantly short periods. The other 13 were mostly long-period (g-mode) pulsators. With Kepler's exquisite duty cycle and data quality, an average of 23 periods per star were detected with ranges from 6 to 44. As the g-mode pulsations are high-overtone (typically n > 10), asymptotic period relations could apply and so we searched for evenly spaced periods. We found these for l =1 and 2 modes in all but one of the Kepler stars and that one outlier has a very complex temporal spectrum caused by a close companion. We were able to associate 204 of 299 measured periods with l = 1 and 2 modes. Those results should provide tight constraints on pulsation models. However, they also offer a surprise as current structure models predict significant mode trapping, which is inconsistent with the period spacings we have found.
Baran Andrzej S.
O'Toole Simon J.
Quint A. C.
Reed Michael D.
Telting John H.
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