The period of the globular cluster X-ray source X1820-303 Confirmation from Ariel V data

Details The period of the globular cluster X-ray source X1820-303 Confirmation from Ariel V data The period of the globular cluster X-ray source X1820-303 Confirmation from Ariel V data

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.225p...7s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 225, March 1, 1987, p. 7P-9P. Research supported by the

Astronomy and Astrophysics

Astronomy

14

Astronomical Spectroscopy, Globular Clusters, Periodic Variations, Spaceborne Astronomy, Spectrum Analysis, X Ray Sources, Ariel 5 Satellite, Exosat Satellite, Orbital Elements

Scientific paper

The authors have analysed archival Ariel V data to search for the proposed period of X 1820-303. A modulation with a period of 685.02±0.54 s (2σ confidence) and a peak-to-peak amplitude of 2.2 per cent is detected from the longest data set. Combining this measurement with the EXOSAT results the authors find the upper limit on the period derivative to be 0.28 s yr-1 (90 per cent confidence). The stability of the period over a time-scale of 10 years suggests that the period is orbital in nature.

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