Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...228l..19b&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 228, Feb. 15, 1979, p. L19-L22.
Astronomy and Astrophysics
Astrophysics
14
Eclipsing Binary Stars, Emission Spectra, Magellanic Clouds, Stellar Luminosity, X Ray Stars, Eclipses, Interstellar Gas, Light Curve, Mathematical Models, Stellar Spectra, X Ray Absorption
Scientific paper
The observation of 0.25-keV X-rays from SMC X-1 by a soft X-ray experiment aboard OSO 8 is reported. The variable soft X-ray source observed is identified with the hard X-ray source SMC X-1 on the basis of a rather abrupt ending to the emission (fall time about 2.5 hr) at the time SMC X-1 was expected to enter eclipse. A source luminosity of about 5 x 10 to the 38th erg/s in the 0.18-0.28-keV range is derived by assuming a distance of 68 kpc and correcting for attenuation by 3.4 x 10 to the 20th H atoms per sq cm of intervening galactic gas; this luminosity is shown to be about a factor of 40 greater than the observed coincident luminosity in the 0.8-3-keV band. The soft X-ray intensity upon emergence from eclipse is found to be reduced by a factor of at least 20 from the peak intensity prior to eclipse. It is suggested that this asymmetry may reflect a geometry in which the soft X-ray source trails the compact star as in an accretion-stream model.
Bunner Alan N.
Sanders Wilton T.
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