Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...459..666a&link_type=abstract
Astrophysical Journal v.459, p.666
Astronomy and Astrophysics
Astronomy
6
Accretion, Accretion Disks, Plasmas, Stars: Pulsars: General, Radiation Mechanisms: Nonthermal, Shock Waves, X-Rays: Stars
Scientific paper
Several X-ray pulsars exhibit line structure in their spectra that has been interpreted as originating from cyclotron processes in the accreting plasma. A few of these objects also show evidence of a second spectral feature that, traditionally, has been thought to be the second cyclotron harmonic. Detailed calculations of the emitted flux spectra are presented that incorporate a simple two-component model of the accretion cap. The two components are modeled as slabs separated by a shock wave, where the postshock slab is the thermalized high-density and -temperature plasma that creates the radiation via bremsstrahlung processes and the preshock material is represented by a relatively cool, low-density plasma that is moving near the free-fall velocity. Results show that two spectral features are easily produced, one representing the fundamental cyclotron harmonic of the postshock plasma, and another that is a Doppler-shifted line produced by scattering in the preshock plasma.
Alexander S. G.
Davila Javier
Dimattio D. J.
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