Thermal Comptonisation in 4U:1700-377

Details Thermal Comptonisation in 4U:1700-377 Thermal Comptonisation in 4U:1700-377

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...283..841m&link_type=abstract

Astronomy and Astrophysics, Vol. 283, NO. 3/MAR(III), P. 841, 1994

Astronomy and Astrophysics

Astrophysics

2

X-Rays: Stars

Scientific paper

We present results of a broad band X-ray observation of the high-mass X-ray binary 4U 1700-377 (HD 153919) with the Kvant observatory in the energy range 4-100 keV. We find that a simple bremsstrahlung spectrum, which has been suggested by previous hard X-ray observations, is not a good description of the 4-100 keV spectrum. We suggest thermal Comptonisation of blackbody photons by a hot plasma on the surface of the neutron star as the emission mechanism. The parameters of the plasma are kT ≍ 30 keV and optical depth τ ≍ 2. The spectral shape of this model gives a good fit to the data and can explain why observations at slightly different energy ranges mimic bremsstrahlung spectra of different temperatures, since its shape can be approximated by bremsstrahlung spectra of different temperatures in different energy intervals.

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