On the possibilities of shocks in accretion and wind flows

Soumen Mondal1* and Prasad Basu2
1Ramkrishna Mission Residential College Narendrapur, Kolkata, India
22National Institute of Technology, Sikkim, India

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In the present study, we investigate the possibilities of shocks in the accretion/wind flows. For the constant ultra-relativistic adiabatic index γ=(4/3), shocks are possible because of the presence of the two saddle type sonic points in the flow. However, employing the relativistic equation of state(EOS) (Synge 1957) in which the adiabatic index varies (5/3 ≤γ ≤ 4/3) from the non relativistic to relativistic regime with temperature we notice that number of the saddle type sonic point reduces to one (Basu & Mondal 2014, 2011) indicating that the formation of shocks in the flow becomes unlikely (Basu & Mondal 2014; Mondal & Basu 2011).

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Keywords : accretion, accretion discs – – shock waves – equation of state – relativity