Computer Science – Numerical Analysis
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasj...45..707m&link_type=abstract
PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 45, no. 5, p. 707-713
Computer Science
Numerical Analysis
26
Accretion Disks, Astronomical Models, Decay, Novae, Numerical Analysis, Stability, X Ray Binaries, X Rays, Angular Momentum, Cooling, Luminosity, Mass Flow, Viscosity
Scientific paper
The physics of the exponential X-ray decay observed in ultrasoft X-ray novae, such as A0620-00 GS 2000+25 and GS 1124-68, is investigated in relation to the outburst mechanism of X-ray novae. It is shown that as long as the total angular momentum of the disk is kept constant, the disk luminosity generally decreases with time in a power-law fashion: Ld proportional to t-n with n being a positive constant, as the mass accretes onto a compact object. However, if mass and angular momentum are removed from the disk at a constant rate, exponential decays, Ld proportional to e-t/t1/e, with t1/e being a constant, are reproduced. The possible mechanisms to remove the mass and angular momentum are discussed in relation to the models for the outbursts. A thermal-ionization instability of hydrogen is the most promising possibility, since the mass and angular momentum are rapidly transferred outward, due to an abrupt change in the temperature (and therefore the kinematic viscosity) at the thermal transition front.
Ishizaka Chiharu
Mineshige Shin
Yamasaki Tatsuya
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