The Evolution and Classification of Postoutburst Novae Spectra
The Evolution and Classification of Postoutburst Novae Spectra
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爆发后新星光谱的演化和分类
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
M. Navarrete
中科院分区：
文献类型：
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作者：
Robert E. Williams;M. Hamuy;M. Phillips;S. Heathcote;L. Wells;M. Navarrete
第一个结果是对新星爆发后光谱进行的长期 CTIO 研究，该研究是使用 CCD 在 3200-1 微米波长范围内获得的。对于某些新星，时间覆盖已经足够完整，可以在光谱演化中观察到连续的阶段，这表明可以对光谱进行分类的方法。提出了一种分类系统，该系统根据较强发射线的特征来定义演化阶段。这些阶段通过电离辐射场和平均气体密度与壳中的物理条件相关。新星喷射物的可靠丰度测定必须在分析中纳入凝结。观测结果还表明，氖新星的光谱演化可能与其他新星的光谱演化不同，因为它不发展日冕发射线。 12 参考文献
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. 12 refs.