Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.274..650v&link_type=abstract
Nature, vol. 274, Aug. 17, 1978, p. 650-653.
Astronomy and Astrophysics
Astronomy
92
Astronomical Models, Luminous Intensity, X Ray Astronomy, X Ray Sources, Black Body Radiation, Black Holes (Astronomy), Bursts, Hydrogen Clouds, Interstellar Gas, Neutron Stars, Pulsed Radiation
Scientific paper
Total integrated fluxes, maximum fluxes, and spectra of X-ray bursts from 10 sources are analyzed, and a uniformity in observed properties is detected. If it is assumed that the peak luminosity in a burst is a standard candle, the data suggest that (1) the effective black body radius observed in bursts is the same for all burst sources; (2) the tails of X-ray bursts are emitted by cooling surfaces whose size is the same for all burst sources (to within + or - 20%); and (3) the total energy emitted from X-ray bursts is the same for all burst sources (to within + or - 30%). This analysis applies to Type I bursts which are emitted by all burst sources and repeat at comparatively long time intervals. The analysis does not apply to Type II bursts, which repeat on time scales of seconds to minutes.
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