Nebular spectra of type IA supernovae as probes for extragalactic distances, reddening, and nucleosynthesis

Details Nebular spectra of type IA supernovae as probes for extragalactic distances, reddening, and nucleosynthesis Nebular spectra of type IA supernovae as probes for extragalactic distances, reddening, and nucleosynthesis

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...400..127r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 400, no. 1, p. 127-137.

Statistics

Computation

37

Astrometry, Interstellar Extinction, Nebulae, Nuclear Fusion, Stellar Spectra, Supernovae, Computational Astrophysics, Feasibility Analysis, Least Squares Method, Nuclear Reactions

Scientific paper

The feasibility of extracting basic information contained in the nebular spectra of supernovae, namely, the amount of Ni synthesized in the explosion, the intervening reddening, and the distance to the parent galaxy, is investigated. Intrinsic characteristics of nebular spectra of Ia SN, such as the dependence of the observed luminosity of Fe III and Fe II forbidden lines at different wavelengths on the initial Ni-56 mass and on the reddening, provide the basis for the multiparameter determination. It is shown that this procedure can yield estimates of the distance to the host galaxy, of the total reddening, and of the Ni mass synthesized in the explosion. The method, when applied to nebular spectra of SN 1986G in Cen A, gives as best values for the model parameters a production of 0.38 +/- 0.03 solar mass of Ni-56, a distance to Cen A of 3.3 +/- 0.3 Mpc, and a reddening of 1.09 +/- 0.02. These results are compared with determinations of the same quantities by traditional methods.

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