The discovery of 39 hour periodic dips in the X-ray intensity of XB 1254 - 690

Details The discovery of 39 hour periodic dips in the X-ray intensity of XB 1254 - 690 The discovery of 39 hour periodic dips in the X-ray intensity of XB 1254 - 690

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...309..265c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 309, Oct. 1, 1986, p. 265-274.

Other

61

Variable Stars, X Ray Binaries, X Ray Spectra, Accretion Disks, Exosat Satellite, Light Curve, Metallicity, Neutron Stars

Scientific paper

The low-mass X-ray binary XB 1254 - 690 has been discovered to show irregular dips in X-ray intensity that recur with a period of 3.9 hr consistent with the optical period derived independently. The spectral changes observed during dipping are complex and can be successfully described using a two-component model. One of these components may be X-rays scattered into the line of sight by an accretion disk corona. In contrast to other X-ray dipping sources for which the metallicity has been measured, the abundance of the material responsible for the dips is close to that of cosmic material.

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