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- W2083014310 abstract "view Abstract Citations References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Computer Program for a Steady-State Gas. Johnson, Hollis R. Abstract In radiating gases of interest in astrophysics the existence of strict (or even local) thermodynamic equilibrium is questionable. The absence of such equilibrium leads to departures from the equilibrium distribution functions, but quantitative estimates of the amount of these departures have not been established for many interesting cases. In general, the answer requires the solution of the set of equations expressing steady state in the atomic energy levels and the set of equations of radiative transfer through the gas. A computer program which will permit comprehensive calculations of steady-state equilibrium in a self-consistent fashion is described. The complete program performs these operations: (1) Determines the monochromatic optical depth Ty (To), where r0 is some standard optical depth, using as input the absorption coefficients Ky and K0 throughout the atmosphere. (2) Finds J(v,T0), the mean intensity, at all wavelengths of interest and at many points throughout the atmosphere from the integral equation. Input for this program are S(v,m) and rp(To), where S is the source function. (3) Calculates the integral of the mean intensity and the absorption coefficient over frequency for all transitions of interest at many values of r0. Input are J(v,T0) and the absorption coefficients as functions of frequency. (4) Solves the steady-state equations to obtain at a number of points in T0 the population of the energy levels, ~~, and S~. The input data are the radiation fields (step 3), atomic parameters, collisional and radiative cross sections, and the temperature and density throughout the gas. An application of the program is made to obtain a self-consistent solution for neutral helium in the shell surrounding a star. A five-level model atom is employed in an atmosphere of constant T0= 100000, N(He) =1011 cm-3, and N0=1012 cm-3 which is excited by a B star. Publication: The Astronomical Journal Pub Date: November 1962 DOI: 10.1086/108776 Bibcode: 1962AJ.....67..578J full text sources ADS |" @default.
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- W2083014310 title "Computer Program for a Steady-State Gas." @default.
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