Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...426..334b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 426, no. 1, p. 334-339
Astronomy and Astrophysics
Astronomy
43
Abundance, Astronomical Models, Computerized Simulation, Helium, Nickel Isotopes, Supernovae, Ultraviolet Astronomy, Ultraviolet Spectra, Visible Spectrum, Astronomical Observatories, Gamma Rays, Hubble Space Telescope, Iron, X Rays
Scientific paper
We present spherically symmetric, non-local thermodynamic equilibrium (non-LTE), expanding model atmosphere synthetic spectra of SN 1993J and compare them to the ultraviolet and optical spectra obtained simultaneously on 1993 April 15 by the Hubble Space Telescope (HST) and at Lick Observatory. We are able to fit the optical and HST near-UV spectra with a variety of compositions, but find that our best fits are obtained with an enhanced helium abundance (Y = 0.8) and significant nonthermal ionization due to gamma rays produced by the decay of Ni-56. We find the effects of X-rays produced by thermal bremsstrahlung in the circumstellar material to have little effect on the spectrum. Our current models are unable to fit the HST far-UV region, predicting too little flux and strong, unseen Fe II features.
Baron Eddie
Branch David
Hauschildt Peter. H.
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