NLTE Synthetic Spectra of Type IA Supernovae

Details NLTE Synthetic Spectra of Type IA Supernovae NLTE Synthetic Spectra of Type IA Supernovae

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.5706n&link_type=abstract

American Astronomical Society, 184th AAS Meeting, #57.06; Bulletin of the American Astronomical Society, Vol. 26, p.953

Astronomy and Astrophysics

Astronomy

Scientific paper

An approximate lambda iteration is used to solve the fully relativistic radiation transport equation to all orders in v/c. The NLTE rate equations are solved for MgII, CaII and NaI using an extension of the method of Rybicki and Hummer 1991, simultaneously with the condition of radiative equilibrium. The Kurucz list of 3 million lines is used to select the approximately 300,000 strongest lines with the populations assumed to be in LTE. The model atmospheres are constructed assuming that the velocity profile is homologous and that the density profile follows either a power law or an exponential falloff. Both SNe 1981B and 1992A are fit from the UV through the optical near maximum light producing reasonable agreement with observations. We discuss the application of the expanding photosphere method to SNe Ia which gives a distance that is independent of those based on radioactive nickel decay and Cepheids variable stars.

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