Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.205..875p&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 205, Nov. 1983, p. 875-888. Research supported by the S
Astronomy and Astrophysics
Astronomy
53
Ariel 5 Satellite, Astronomical Catalogs, Bursts, Sky Surveys (Astronomy), Stellar Flares, X Ray Sources, Isotropy, Light Curve, Spatial Distribution, Variable Stars
Scientific paper
The Sky Survey Instrument (SSI) on Ariel V scanned the sky for 5.5 yr (about 30,000 orbits) in the energy band 2-18 keV, with a time resolution of one orbit (about 100 min). A systematic search has been made of the SSI database for fast-transient outbursts lasting one, or sometimes a few orbits. A discovery has been made of 27 fast-transient sources above the sensitivity limit of 8 SSI counts/sec, only two of which exhibited more than one outburst. It is estimated that an isotropic detector otherwise similar to the SSI would detect the start of one outburst every 3 days. The sources are isotropically distributed on the sky thereby favouring a nearby or extragalactic origin. Eleven of the sources are identified, including six with nearby RS CVn-like systems for which the observations favor a 'large loop' model. It is probable that many of the presently unidentified fast-transients also arise from nearby RS CVn (or related) systems although the observations do allow the possibility of outbursts from extragalactic objects out to a redshift of about 0.06.
McHardy Ian M.
Pye John P.
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