Ia型超新星光谱的比较直接分析。五、从更大样本和定量细分中获得的见解
Comparative Direct Analysis of Type Ia Supernova Spectra. V. Insights from A Larger Sample and Quantitative Subclassification
摘要：
本文根据新的资料，对Ia型超新星（SNe Ia）的光谱进行了比较研究。讨论是根据本系列以前的论文中定义的四组来进行的：核心正常（CN）;宽线（BL）;冷（CL）;和浅硅（SS）。Ia型超新星光谱多样性的新特征包括：（1）极端的CL类SN 1991 bg并不是一个物理上不同的亚群;（2）存在大量的SN 1999 aa类SS，它们彼此非常相似，甚至在最大光照后三周才能与CN区分开来。SN 1999 aa类可能相对较多，但不是一个物理上不同的亚组。本文讨论了基于5750 A和6100 A附近最大光吸收特征的等效宽度对Ia型超新星进行定量光谱分类的有效性。氯化萘小样本的绝对星等离散度不大于特征绝对星等不确定度。
英文摘要：
A comparative study of optical spectra of Type Ia supernovae (SNe Ia) is extended, in the light of new data. The discussion is framed in terms of the four groups defined in previous papers of this series: core normal (CN); broad line (BL); cool (CL); and shallow silicon (SS). Emerging features of the SN Ia spectroscopic diversity include evidence (1) that extreme CL SN 1991bg-likes are not a physically distinct subgroup and (2) for the existence of a substantial number of SN 1999aa-like SSs that are very similar to each other and distinguishable from CN even as late as three weeks after maximum light. SN 1999aa-likes may be relatively numerous, yet not a physically distinct subgroup. The efficacy of quantitative spectroscopic subclassification of SNe Ia based on the equivalent widths of absorption features near 5750 A and 6100 A near maximum light is discussed. The absolute magnitude dispersion of a small sample of CNs is no larger than the characteristic absolute magnitude uncertainty.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
