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Description
This work investigates the astero seismological properties of RR Lyrae variable stars through a detailed comparison of light curves obtained from the Kepler Space Telescope, the Oukaimeden Observatory, and the TESS satellite. Focusing on the prototype RR Lyr, we explore the synergy between high-precision space-based data and complementary ground-based observations.
Kepler provided continuous 90-day monitoring with a cadence of 30 minutes, while Oukaimeden offered 45 nights of ground-based photometry with variable intervals. Fourier analysis, performed using the Period04 software, uncovered the primary pulsation frequencies of RR Lyr:
· f₀ = 1.764 (1/days)
· 2f₀ = 3.528 (1/days)
· 3f₀ = 5.292 (1/days)
Despite the higher noise level in Oukaimeden’s data, these frequencies matched those detected by Kepler, validating the consistency of the results. TESS data was incorporated to cross-check the findings and evaluate its potential for variable star studies.
The physical parameters of RR Lyr were determined as follows:
· Metallicity: [Fe/H] = -1.3
· Color: (B-V) = 0.36
· Effective temperature: T_eff = 6,500 K
· Absolute magnitude: M_v = 0.61
· Surface gravity: log g = 2.7
The Blazhko effect was identified in Kepler data with a frequency of Fb = 0.0256 (1/days), corresponding to a Blazhko period of 39.04 days.
This comparative study underscores the advantages of Kepler’s unparalleled precision and highlights the potential of ground-based observatories like Oukaimeden to contribute to astero seismological research, especially when complemented by space-based platforms like TESS. The results showcase the robustness of combining diverse data sources to deepen our understanding of variable star behavior and advance stellar astrophysics.
| Stream | Science |
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