Mode Identification for Subdwarf B Stars Using Period Spacings in Kepler Data
During the Kepler spacecraft’s first year of operation, its short cadence observations were obtained in a survey mode where targets received one month of nearly continuous observations. Forty eight subdwarf B stars were observed of which 14 were found to be pulsators, 13 having predominantly long (g mode) periods. We applied asymptotic relations to the g-mode pulsations and discovered evenly spaced in period sequences for ℓ = 1 and 2 modes in all of the stars. We were able to associate 222 of 317 measured periods with ℓ = 1 and 2 modes which should provide tight constraints on pulsation models. We use the period spacings to compare with theoretical masses of these stars.
KeywordsMode Identification Asymptotic Relation Horizontal Branch Pulsation Model Period Spacing
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