Physics
Scientific paper
Dec 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973pthph..50.1867i&link_type=abstract
Progress of Theoretical Physics, Vol. 50, No. 6, pp. 1867-1878
Physics
5
Scientific paper
A theoretical model of Sco X-1 phenomena is developed, based on the idea of a magnetic white dwarf undergoing accretion. A magnetohydrodynamic analysis of the accreting plasma flow predicts a formation of shock-like structure at a distance tilde{R}-R from the stellar surface, where R is the stellar radius; inside the shock front, the plasma is heated through excitation of plasma trubulence, and thereby emits copious electromagnetic radiation mostly in the X-ray domain. We then carry out an optical analysis of the accreting plasma with emphasis on its luminosity and optical depth. The total luminosity of 1037 erg/sec and the cutoff frequency around 2.25 eV can be fitted with such magnetohydrodynamic and optical analyses by the choice of the parameters, for example: R=2× 108 cm, M=M&sun;, tilde{R}-R=7.4×104 cm, plasma density in the radiation domain = 4.8× 1018 cm-3, and the surface magnetic field = 1.8 × 106 gauss. The origin of the superthermal hard X-rays is accounted for in terms of the stochastic acceleration of electrons in the turbulent plasma. A possible mechanism of radio flaring is also suggested.
Ichimaru Setsuo
Nakano Takanori
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