The discovery of a 25 min regular modulation in the X-ray flux from 2S0142 + 61

Details The discovery of a 25 min regular modulation in the X-ray flux from 2S0142 + 61 The discovery of a 25 min regular modulation in the X-ray flux from 2S0142 + 61

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ssrv...40..157w&link_type=abstract

(ESA, ESLAB Symposium on X-Ray Astronomy in the EXOSAT Era, 18th, The Hague, Netherlands, Nov. 5-9, 1984) Space Science Reviews

Astronomy and Astrophysics

Astronomy

2

Astronomical Spectroscopy, Periodic Variations, Radiant Flux Density, Spaceborne Astronomy, X Ray Sources, Exosat Satellite, Light Curve, Modulation, Spectral Energy Distribution, Stellar Spectrophotometry

Scientific paper

A 13 hr observation of 2S 0142+61 on 1984 August 27 by EXOSAT shows the X-ray flux of 2S 0142+61 to be modulated with a period of 1456+/-6 s. The 1 - 10 keV spectrum is two component with a ≡0.7 keV thermal and 0.0 energy index power law, with 30% of the total luminosity in the thermal component. The spectrum is absorbed by ≡1×1022 H cm-2. Only the hard component is pulsed with a 3 to 10 keV peak to mean amplitude of 35%. Below 2 keV the modulation is less than a few percent. The total 1 - 10 keV luminosity is 3.5×1032erg s-1 for a distance of 100 pc. Possible optical counterparts are discussed.

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