Discovery of a very fast optical activity in the X-ray source GX 339-4.

Details Discovery of a very fast optical activity in the X-ray source GX 339-4. Discovery of a very fast optical activity in the X-ray source GX 339-4.

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981msngr..26...28m&link_type=abstract

The Messenger, vol. 26, p. 28-30

Computer Science

X-Ray Sources:Variations

Scientific paper

Most galactic X-ray sources are compact objects (white dwarfs, neutron stars and maybe black holes) in binary systems. Matter coming from anormal companion star is driven onto the surface of the compact object where the release of gravitational energy powers the X-ray emission. The energy emitted at X-ray wavelengths ranges from 1035 to 1038 erg/s and a mass transfer rate of typically 10-11 to 10-8 M0 /year is enough to explain the X-ray luminosity. In most of the cases an accretion disk is formed around the compact object due to the angular momentum carried by the matter escaping the companion star. Recent investigations have shown that the accretion disks can be very large and that the heating of theirsurface by the X-rays emitted by the central source can make them very luminous.

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