Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...207l.105c&link_type=abstract
Astrophysical Journal, vol. 207, July 15, 1976, pt. 2, p. L105-L108.
Astronomy and Astrophysics
Astronomy
39
Globular Clusters, Satellite-Borne Instruments, X Ray Sources, Light Curve, Neutron Stars, Spaceborne Astronomy
Scientific paper
Observational data are presented on ten brief X-ray bursts, recurrent at nearly equal time intervals, recorded during a two-day observation of 3U 1820-30 in the globular cluster NGC 6624 with the wide-field modulation collimator detectors on the SAS-3 X-ray observatory. The occurrence times were fitted by least squares to a linear sequence with an rms deviation of 621 sec, corresponding to a phase jitter of 3.9%. The bursts were observed in two energy channels. For a sequence of five of the most clearly observed bursts, the 2-6 keV rate rose to its peak value in about 1 sec and then decayed to preburst level in about 10 sec. The 6-11 keV rate rose more slowly and decayed similarly. The smooth decay of their averaged light curve suggests the temporal evolution may have a geometrical origin, where Compton scattering in a surrounding cloud of hot plasma stretches the pulse out and causes a progressive hardening of the spectrum.
Bradt Hale
Canizares Claude
Clark George W.
Jernigan Garret J.
Lewin Walter H. G.
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