The Effects of Lines on the Mean Opacities in Novae, Supernovae, and Accretion Disks

Details The Effects of Lines on the Mean Opacities in Novae, Supernovae, and Accretion Disks The Effects of Lines on the Mean Opacities in Novae, Supernovae, and Accretion Disks

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992rmxaa..23..247w&link_type=abstract

Revista Mexicana de Astronomia y Astrofisica, 23, 247

Astronomy and Astrophysics

Astronomy

1

Scientific paper

RESUMEN. Para la soluci6n de las ecuaciones de hidrodinamica en medios con movimiento diferencial se requiere el calculo del fiujo de radiaci6n, del gradiente de la presi6n de radiaci6n y del balance energetico. Despue's de discutir brevemente las deficiencias de las aproximaciones que generalmente se usan, sugerimos un m6todo preciso para el calculo de estas cantidades por medio de tres coeficientes de opacidad media que sustituyen a la media de Rosseland del caso estatico. Este enfoque permite incluir consistentemente la importante contribuci6n de las lineas espectrales al campo de radiaci6n. ABSTRACT. For the solution of the hydrodynamic equations in differentially moving media the calculation of the radiation fiux, the gradient of the radiation pressure, and the energy balance is required. After a brief discussion of the shortcomings of the approximations which are frequently made, we suggest a fast method for the accurate calculation of these quantities by means of three mean opacity coefficients which replace the Rosseland mean of the static case. This method allows a consistent inclusion of the important contribution of spectral lines to the radiation field. Key words: ACCRETION - OPACITIES - STARS: NOVAE - STARS: SUPERNOVAE

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