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Astron. Astrophys. 363, 640-646 (2000)

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The jets of SS 433: second order effects

W. Brinkmann 1 and N. Kawai 2

1 Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, 85740 Garching, Germany
2 Cosmic Radiation Laboratory, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-01, Japan

Received 17 May 2000 / Accepted 22 September 2000

Abstract

Previous analyses of the X-ray emission from SS 433 have assumed conically out-flowing jets of hot plasma in ionizational equilibrium conditions to deduce the system's physical parameters from the data. Current X-ray instruments are sensitive enough to detect the effects of second order deviations from these simple assumptions in the measured spectra. We have modeled the two dimensional hydrodynamic outflow of the jets with different initial conditions, and considered non-equilibrium effects and photoionization in the plasma. The deviations from the canonical model are discussed and the influence on the determination of the system's physical parameters are evaluated.

Key words: stars: individual: SS433 – X-rays: general – radiation mechanisms: thermal – hydrodynamics

Send offprint requests to: W. Brinkmann (wpb@mpe.mpg.de)

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© European Southern Observatory (ESO) 2000

Online publication: December 11, 2000
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