超新星1994I的光球相光谱

The Photospheric Spectra of SN1994I

本文给出用北京天文台２．１６ｍ光学望远镜观测的超新星１９９４Ｉ的光球相光谱。这些光谱表现出类似于Ｉｃ型超新星１９８７Ｍ的特征。我们用蒙特卡罗光谱合成模型对４月１０日的光谱做了拟合。采用Ｎｏｍｏｔｏ等人Ｃ＋Ｏ模型的元素丰度及修改过的Ｗ７密度结构，计算的光谱与观测的光谱符合得相当好。计算得到４月１０日，超新星的光球速度约为１０００ｋｍ／ｓ，其黑体温度约为８０００Ｋ。另外，我们的光谱拟合可以为Ｃ＋Ｏ星作为Ｉｃ型超新星的前身星提供证据。

We present the photospheric optical spectra of SN1994I obtained with the 2.16m reflector of Beijing Astronomical Observatory. The spectra show features of type Ic supernovae as those of SN1987M did. A Monte Carlo spectrum synthesis code is employed to fit the April 10 spectrum. With the abundances of Nomoto et al. and an altered W7 density structure,we get a reasonable fit.For April 10, we find a photospheric velocity of ～10000kms-1,and a blackbody temperature of～8000K.The mass outside the photosphere at the epoch is 0.365M⊙. The modeling may provide evidence for C+O stars as progenitors of Type Ic supernovae.