TL;DR
This study conducts a high-precision frequency analysis of the RRd variable BS Comae, revealing the nonlinear coupling effects between its pulsation modes with minimal additional components.
Contribution
It provides a detailed multicolor frequency analysis of BS Comae, demonstrating the absence of significant nonlinear combination components beyond linear mode interactions.
Findings
No significant combination frequencies above millimagnitude level.
High-precision multicolor photometry enables detailed mode coupling analysis.
Linear combinations dominate the nonlinear coupling in BS Comae.
Abstract
We present the frequency analysis of the multicolour time series photometry of the field RRd variable BS Comae. The large number of data points in each of the BV(RI)_c bands and the ~0.01 magnitude accuracy of the individual measurements allow us a high precision analysis of the properties of the combination frequencies due to nonlinear coupling. Through the combination of the frequency spectra in different colors we show that except for the components corresponding to the linear combinations of the two pulsation modes, there are no other components present above the millimagnitude amplitude level.
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