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• W2794348524 abstract "Detailed knowledge of the variability of classical Cepheids, in particular their modulations and mode composition, provides crucial insight into stellar structure and pulsation. However, tiny modulations of the dominant radial-mode pulsation were recently found to be very frequent, possibly ubiquitous in Cepheids, which makes secondary modes difficult to detect and analyse, since these modulations can easily mask the potentially weak secondary modes. The aim of this study is to re-investigate the secondary mode content in the sample of OGLE-III and -IV single-mode classical Cepheids using kernel regression with adaptive kernel width for pre-whitening, instead of using a constant-parameter model. This leads to a more precise removal of the modulated dominant pulsation, and enables a more complete survey of secondary modes with frequencies outside a narrow range around the primary. Our analysis reveals that significant secondary modes occur more frequently among first overtone Cepheids than previously thought. The mode composition appears significantly different in the Large and Small Magellanic Clouds, suggesting a possible dependence on chemical composition. In addition to the formerly identified non-radial mode at $P_2 approx 0.6ldots 0.65 P_1$ (0.62-mode), and a cluster of modes with near-primary frequency, we find two more candidate non-radial modes. One is a numerous group of secondary modes with $P_2 approx 1.25 P_1$, which may represent the fundamental of the 0.62-mode, supposed to be the first harmonic of an $l in {7,8, 9}$ non-radial mode. The other new mode is at $P_2 approx 1.46 P_1$, possibly analogous to a similar, rare mode recently discovered among first overtone RR Lyrae stars." @default.
• W2794348524 created "2018-03-29" @default.
• W2794348524 creator A5061996212 @default.
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• W2794348524 date "2018-06-09" @default.
• W2794348524 modified "2023-10-17" @default.
• W2794348524 title "Investigating light-curve modulation via kernel smoothing – II. New additional modes in single-mode OGLE classical Cepheids" @default.
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• W2794348524 doi "https://doi.org/10.1093/mnras/sty891" @default.
• W2794348524 hasPublicationYear "2018" @default.
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