Strong effects of time-dependent ionization in early SN 1987A
Strong effects of time-dependent ionization in early SN 1987A
复制标题
SN 1987A 早期时间依赖性电离的强烈影响
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
Russia.
中科院分区：
文献类型：
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作者：
V. Utrobin;N. N. C. M. F. Astrophysik;Germany Institute of Theoretical;E. Physics;R. A. O. Sciences;Russia.
We study time-dependent hydrogen ionization in the atmosphere of SN 1987A during the first month after the supernova explosion. The model includes kinetics of hydrogen ionization and excitation, molecular hydrogen kinetics, and a time-dependent energy balance. The primary strong effect of the time-dependent ionization is the enhanced hydrogen ionization compared to the steady-state model. The time-dependent ionization provides a sufficient population of excited hydrogen levels to account for the observed H α without invoking the external 56 Ni. We find that the Ba II 6142 A line in SN 1987A can be reproduced for the LMC barium abundance. This resolves the long-standing problem of the unacceptably high barium overabundance in SN 1987A. The key missing factor responsible for the “barium problem” is the time-dependent ionization. The modelling of the H α profile on day 4.64 indicates the ratio of the kinetic energy to the ejected mass ≈ $0.83 imes 10^{50}~{
m erg},M_{odot}^{-1}$.
