TESS fits show higher strengths of modes 2 and 4 relative to mode 1 in CO Cam in 2024 than in 2019

We compare four known pulse modes of CO Camelopardalis with public 120-second TESS data. The endpoint comparison uses sector 14 in 2019 and the equal-sector mean of sectors 74 and 75 in 2024. Each mode includes its orbit side peaks. The mode-2 to mode-1 strength ratio increases by 63.8%, with a conditional simultaneous 95% interval of 42.7% to 88.1%. The mode-4 ratio increases by 44.9%, with an interval of 12.7% to 86.2%. The mode-3 ratio changes by 7.1%, with an interval of -10.4% to 27.9%. The three contrasts were fixed before flux inspection. An initial frequency limit was reached, so we widened the frequency range and added checks. The final result is exploratory. The intervals assume the fitted pulse model and independent residual noise blocks. They exclude shared calibration errors, unknown close modes, and choices made after inspection. A common flux scale alone cannot cause these ratio changes. The result does not identify a physical cause. The package preserves ten original light curves, source records, plans, code, fit results, numerical checks, figures, and repeat instructions.

CO Camelopardalis · CO Cam · TIC 160268882 · TESS · stellar pulsation · binary stars · amplitude variation · tidal pulsation · reproducible analysis