Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989natur.337..439s&link_type=abstract
Nature (ISSN 0028-0836), vol. 337, Feb. 2, 1989, p. 439-442. Research supported by the Robert A. Welch Foundation, NSF, and Cray
Astronomy and Astrophysics
Astronomy
14
Astronomical Spectroscopy, Stellar Atmospheres, Supernova 1987A, Visible Spectrum, Atmospheric Models, Gamma Ray Spectra, Hydrogen, Light Curve, Spectral Line Width, X Ray Spectra
Scientific paper
The late-time nebular spectra of SN1987A are investigated by computing the emergent spectra from model atmospheres. The new features of this calculation are the inclusion of a complex model hydrogen atom and the self-consistent treatment of an opaque lower boundary which approximates the observed continuum. Hydrodynamic models reported in the literature which are known to reproduce the observed light curve and gamma-ray and X-ray spectra are adopted, and qualitative agreement with observed optical spectra is obtained. By examining the effect of mixing core material into the envelope, it is found that the metals in the hydrogen-rich envelope make a substantial contribution to the optical nebular lines even for models with no outward mixing of the core material; however, a significant fraction of the energy emitted in Co-56 decay must be deposited in the envelope to produce the observed linewidths and hydrogen line strengths.
Harkness Robert P.
Swartz Douglas A.
Wheeler Justin C.
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