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Spectrum Analysis of the Type Ib Supernova 1999dn: Probable Identifications of C II and H-alpha

J. S. Deng·Y. L. Qiu·J. Y. Hu·K. Hatano·D. Branch
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Abstract

Low resolution spectra of SN 1999dn at early times are presented and compared with synthetic spectra generated with the parameterized supernova synthetic-spectrum code SYNOW. We find that the spectra of SN 1999dn strongly resemble those of SN 1997X and SN 1984L, and hence we classify it as a Type Ib event. Line-identifications are established through spectrum synthesis. Strong evidence of both H-alpha and C II 6580 is found. We infer that H-alpha appears first, before the time of maximum brightness, and then is blended with and finally overwhelmed by the C II line after maximum; this favors a thin high-velocity hydrogen skin in this Type Ib supernova.

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J. S. Deng, Y. L. Qiu, J. Y. Hu, K. Hatano, D. Branch. 2000-05-15. Spectrum Analysis of the Type Ib Supernova 1999dn: Probable Identifications of C II and H-alpha. https://doi.org/10.1086/309335

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