Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988stin...8924238l&link_type=abstract
Unknown
Astronomy and Astrophysics
Astronomy
Binary Stars, Emission Spectra, Stellar Evolution, Stellar Mass Accretion, Stellar Physics, Variability, X Ray Stars, Exosat Satellite, Optical Properties, Stellar Spectrophotometry, X Ray Astronomy, X Ray Spectra
Scientific paper
The photometric and spectral variability of two low mass X-ray binary stars in the galactic center were investigated onboard the European X-ray observatory EXOSAT. The physics of low mass X-ray binaries is reviewed, and the X-ray satellite EXOSAT and its instruments are described. The observations of the two investigated systems, GX17+2 and 4V1705-44 are compared with the observations of other low mass X-ray binary stars. A coherent picture of the variability of the investigated binary stars is sketched, and the possible physical mechanisms of the variability are depicted. The X-ray spectra of both systems are described with an emission model. The spectra change with intensity. Both systems show fast aperiodic fluctuations with a red frequency spectrum, which can be described by an exponential law. The evolution and the amplitude of the mass accretion rate were determined.
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