Photoelectric photometry of the RRs variable GP And

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Electrophotometers, Giant Stars, Hot Stars, Stellar Spectrophotometry, Variable Stars, Light Curve, Pulse Amplitude, Stellar Magnitude, Tables (Data)

Scientific paper

Medium-to-high-time-resolution photoelectric observations of the RRs variable GP And are discussed. It is found that the fundamental pulsation with period P1 0.07868270d is superposed by the following types of disturbances: (1) variability of the mean brightness (no period detected); (2) variability of amplitude (possible period P2 0.64d); (3) superposition of an 18-minute wave (possibly only near minimum and with phase fluctuations); and (4) variability of the shape of the light curve in individual cycles.

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