A new kind of oscillation in the persistent emission of the Rapid Burster

Mathematics – Probability

Scientific paper

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Binary Stars, Exosat Satellite, Stellar Oscillations, X Ray Stars, Light Curve, Power Spectra

Scientific paper

We present a study of a new kind of oscillation found in the persistent emission after some type II bursts from the Rapid Burster observed during 1985 August with EXOSAT. All 95 bursts observed were longer than 30 s. Ten of them were followed by these oscillations. The frequency of the oscillations ranged from 39 to 56 mHz. A period decrease (by 30-50 percent) over a time-scale of about 100 s was observed in seven cases. The fractional rms variation of the oscillations ranged from 5 to 15 percent. In eight cases, about 4-Hz quasi-periodic oscillations with fractional rms values from 6 to 19 percent were observed simultaneously with the new oscillations. There is a high probability that the two forms of oscillation are related to one another.

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