Spectral classification of Low Mass X-ray Binaries (LMXB) energy spectra with color-color diagrams

Details Spectral classification of Low Mass X-ray Binaries (LMXB) energy spectra with color-color diagrams Spectral classification of Low Mass X-ray Binaries (LMXB) energy spectra with color-color diagrams

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988stin...8828837s&link_type=abstract

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Classifications, Colorimetry, Stellar Color, Stellar Spectra, X Ray Binaries, Astronomical Models, Astronomical Spectroscopy, Exosat Satellite, Parameterization

Scientific paper

With the use of color-color diagrams, EXOSAT observations of 25 accretion driven galactic X-ray sources were analyzed. Low mass X-ray binaries (LMXB) populate a region in this diagram, which is considerably different from other types of sources. They appear in at least three spectral modes with characteristic correlation profiles in the color-color diagram, a horizontal branch (HB), a normal branch mode (NB) and a flaring branch mode (FB). The majority of the bright galactic bulge sources is found in the NB. A few flaring branches are observed; horizontal branches are scarce. On the grounds of spectral fits to Cyg X-2 data using a simple blackbody and thermal bremsstrahlung, spectrum correlation profiles for the different spectral modes were simulated with a wide range of input parameters. The major spectral differences between LMXB objects can be associated with different interstellar column densities. After correcting for this effect the normal branch color-color correlation profiles overlap and align along one simple curve. This indicates that the spectra can be parameterized with such a model. Upper and lower values for the temperature of the spectral components are given.

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