The evolution and classification of postoutburst novae spectra

Details The evolution and classification of postoutburst novae spectra The evolution and classification of postoutburst novae spectra

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...376..721w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 376, Aug. 1, 1991, p. 721-737.

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100

Novae, Stellar Spectra, Bursts, Infrared Spectra, Stellar Evolution

Scientific paper

The first results are presented of a long-term CTIO study of the postoutburst spectra of novae, obtained with CCDs over the wavelength interval 3200-1 microns. For certain novae, the temporal coverage has been sufficiently complete that successive stages are observed in the spectral evolution, suggesting a method by which the spectra may be classified. A classification system is proposed which defines phases in evolution in terms of the characteristics of the stronger emission lines. These phases are related to physical conditions in the shell through the ionizing radiation field and mean gas density. Reliable abundance determinations of nova ejecta must incorporate condensations in the analyses. The observations also indicate that the spectral evolution of neon novae may differ from that of other novae in not developing coronal emission lines.

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