X-radiation limited accretion flow. II - Stability and time dependence

Details X-radiation limited accretion flow. II - Stability and time dependence X-radiation limited accretion flow. II - Stability and time dependence

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...260..768s&link_type=abstract

Astrophysical Journal, Part 1, vol. 260, Sept. 15, 1982, p. 768-779.

Astronomy and Astrophysics

Astrophysics

9

Bremsstrahlung, Stellar Flares, Stellar Luminosity, Stellar Mass Accretion, X Ray Sources, Flow Stability, Hydrodynamic Equations, Mass Flow, Time Dependence

Scientific paper

Local and global stability analyses of spherically symmetric, X-ray heated and optically thin accretion flow show that solutions exist which, although globally stable, become subject to a finite amplitude drift instability due to bremsstrahlung cooling at luminosities which exceed a near equality between the L(x)/L(E) ratio and the e(asterisk)/e ratio, where the former term is approximately 0.003 and e is the X-ray production efficiency. Time integrations in the unstable regime show X-ray flares on time scales of 0.4-30 (mass/solar mass) days.

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