OSO-7 observations of the X-ray nova 3U 1543-47

Details OSO-7 observations of the X-ray nova 3U 1543-47 OSO-7 observations of the X-ray nova 3U 1543-47

Jan 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...203..187l&link_type=abstract

Astrophysical Journal, vol. 203, Jan. 1, 1976, pt. 1, p. 187-192.

Astronomy and Astrophysics

Astrophysics

32

Light Curve, Novae, Oso-7, Variable Stars, X Ray Sources, Astronomical Models, Bremsstrahlung, Giant Stars, Periodic Variations, Proportional Counters, Spectrum Analysis, Stellar Mass Ejection, Uhuru Satellite, Vela Satellites

Scientific paper

The intensity and spectrum of the transient X-ray source 3U 1543-47 were measured by X-ray detectors on the OSO-7 satellite on 13 occasions between November 1971 and December 1972. The results, together with observations of the same object by the Vela and Uhuru satellites, can be described in terms of four qualitatively distinct phases in the X-ray light curve: (1) outburst; (2) relatively steady intensity and spectrum; (3) rapid decrease in intensity and decrease in apparent temperature; and (4) irregular intensity fluctuations with complex spectra. The term 'X-ray nova' is proposed to characterize this and similar transient sources, and a new model for such X-ray novae is proposed.

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