Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..209d&link_type=abstract
In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 1: X Ray Binaries p 209-213 (SEE N90-25711 19-89)
Astronomy and Astrophysics
Astronomy
1
Bursts, Centroids, Frequency Measurement, Stellar Oscillations, X Ray Binaries, Energy Spectra, Frequencies, Periodic Variations, Spectral Bands, Spectral Energy Distribution
Scientific paper
Strong Quasi-Periodic Oscillations (QPO) in type 2 bursts from the rapid burster with Ginga were detected. The QPD have centroid frequency of approximately 5 and 2 Hz during bursts which lasted for approximately 10 and 30 sec, respectively. The QPO observations were analyzed and the following results were obtained: QPO centroid frequencies have some correlation with burst duration and peak count rate, however the correlations are complicated and the burst parameters do not uniquely determine the QPO centroid frequency; the appearance of the QPO is closely related to the so-called timescale-invariant profile of the bursts; the QPO are significant only in the even numbered peaks of the profile and not in the odd numbered peaks; in most cases the QPO centroid frequency decreases up to approximately 25 percent during a burst. The energy spectra at the QPO peaks and valleys were investigated and the QPO peaks were found to have significantely higher blackbody temperature than the QPD valleys.
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