X-ray and optical observations of SCO X-I

Details X-ray and optical observations of SCO X-I X-ray and optical observations of SCO X-I

Jul 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976mnras.176...91w&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 176, July 1976, p. 91-102. Research supported by the Science Research C

Astronomy and Astrophysics

Astronomy

40

Eclipsing Binary Stars, Variable Stars, X Ray Stars, Emission Spectra, Flares, Oao 3, Plasma Temperature, Proportional Counters, Stellar Luminosity, Stellar Spectrophotometry, Time Response

Scientific paper

The paper reports a number of Copernicus observations of Sco X-I, in both its quiescent and active states, made between 1973 and 1975. The active states consisted of flaring intervals lasting several hours, made up of series of bursts with duration 4-15 min, and involving intensity increases up to almost twice the nonflaring level. Temperatures during this state ranged from 5.5 to more than 20 keV and were well correlated with the intensity level. During quiescent states, the source exhibited 20% flux variability over several hours, with a lower emission measure and higher temperature than at the corresponding flux level in the active state. During active states, the minimum source intensity (between flares) has the same value in all observations, some of which were separated by up to 2 years. In quiescent periods, the intensity was never below this minimum. These data are discussed and compared with the results of previous observers. Some optical photometric and spectroscopic results obtained simultaneously with a Copernicus observation are also presented.

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