Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206l.135b&link_type=abstract
Astrophysical Journal, vol. 206, June 15, 1976, pt. 2, p. L135-L138. DOD-ERDA-sponsored research.
Astronomy and Astrophysics
Astronomy
66
Satellite Observation, Spaceborne Astronomy, X Ray Sources, Bursts, Flares, Transient Response, Vela Satellites, X Ray Stars
Scientific paper
The letter reports the discovery by the two Vela 5 satellites of 10 intense X-ray flares from the same region of the sky centered in the constellation Norma. The results were obtained from data records covering a 15-month period and which showed 20 count-rate enhancements at least 15 sigmas above the background level. It is noted that the observations are consistent with short X-ray bursts from a single object and that the most intense flare was 0.75 of the quiet-phase intensity of Sco X-1. The observed hardness ratios are found to vary considerably from event to event and to be significantly higher than the typical values observed for Sco X-1. It is suggested that if a single source is assumed and if the flares occur randomly in time, then flares of the type detected by the Vela satellites occur at least 30 times per year.
Belian Richard D.
Conner J. P.
Evans Dafydd W.
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