Accreting White Dwarf as an Emitter of Luminous Super Soft X-Radiation

Physics

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Scientific paper

As a candidate of luminous super soft X-ray sources ( LSSS ) an accreting binary white dwarf ( WD ) of mass 1.3M have been considered . A red giant or a near main sequence star , more massive than the WD , when transfers high mass ( ~ 10-7 M / year ) towards WD , thermonuclear burning will be there on the accreting surface . The accreting matter containing small fraction of heavy nuclei - C, O, Ne, Mg - will capture proton at the high temperature condition leading to CNOF, NeNa, MgAlSi cyclic reactions. Energy generations due to these cyclic reactions have been studied to examine whether steady state nuclear burning can contribute to emit SS X- radiations. During the steady H-burning for 25 years CNOF , NeNa, MgAlSi cycle generates energy 5.46 * 109 , 1.12 * 109 , 2.88 * 108 ( erg g-1 s-1 ) respectively . Observed luminosities by Einstein , ROSAT, ASCA observatories are found to be explainable due to all these three cyclic operations , operating at the base of the envelope of the accretor . Absorptive and electron-scattering opacities at layers of the envelope and color temperature near the photosphere have been determined.

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