SN 1991T: Further Evidence of the Heterogeneous Nature of Type IA Supernovae
SN 1991T: Further Evidence of the Heterogeneous Nature of Type IA Supernovae
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DOI：
10.1086/116177
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发表时间：
1992-05
期刊：
影响因子：
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通讯作者：
M. Phillips;L. Wells;N. Suntzeff;M. Hamuy;B. Leibundgut;R. Kirshner;C. Foltz
中科院分区：
文献类型：
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作者：
M. Phillips;L. Wells;N. Suntzeff;M. Hamuy;B. Leibundgut;R. Kirshner;C. Foltz
SN 1991T在B极大值前一周左右获得的光谱没有显示出通常在Ia型超新星早期主要存在的Si， Ca和S吸收谱线的证据。然而，在最大值后的两周内，SN 1991T的光谱已经演变成与其他Ia型事件非常相似。这些观测结果表明，SN 1991T外喷发物中Si、Ca和S的丰度异常低。SN 1991T的B和V光曲线与其他Ia型超新星的相似，但在两种颜色中，最大值之后的初始衰减斜率都没有正常的陡峭
Optical spectra of SN 1991T obtained approximately one week before B maximum showed no evidence of the Si, Ca, and S absorption lines which normally dominate the spectra of type Ia supernovae at early phases. Nevertheless, within two weeks after maximum, the spectrum of SN 1991T had evolved to resemble closely that of other type Ia events. These observations suggest that the abundances of Si, Ca, and S in the outer ejecta of SN 1991T were unusually low. The B and V light curves of SN 1991T resembled those of other type Ia supernovae, but the slope of the initial decline following maximum was less steep than normal in both colors