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The massive binary companion star to the progenitor of supernova 1993J

机译：超新星1993J的祖先的巨大双星伴星

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The massive star that underwent a collapse of its core to produce supernova (SN)1993J was subsequently identified as a non-variable red supergiant star in images of the galaxy M81 taken before explosion. It showed an excess in ultraviolet and B-band colours, suggesting either the presence of a hot, massive companion star or that it was embedded in an unresolved young stellar association. The spectra of SN1993J underwent a remarkable transformation from the signature of a hydrogen-rich type II supernova to one of a helium-rich (hydrogen-deficient) type Ib. The spectral and photometric peculiarities were best explained by models in which the 13-20 solar mass supergiant had lost almost its entire hydrogen envelope to a close binary compan-ion, producing a 'type IIb' supernova, but the hypothetical massive companion stars for this class of supernovae have so far eluded discovery. Here we report photometric and spectroscopic observations of SN1993J ten years after the explosion. At the position of the fading supernova we detect the unambiguous signature of a massive star: the binary companion to the progenitor.
机译：在爆炸前拍摄的M81星系图像中，经历了核心坍缩以产生超新星（SN）1993J的大质量恒星随后被确定为不变红色超巨星。它显示出过多的紫外线和B波段颜色，表明存在着炽热的大质量伴星，或者它嵌入了一个尚未解决的年轻恒星协会中。 SN1993J的光谱经历了从富氢II型超新星到富氦（缺氢）Ib之一的显着转变。光谱和光度学特性可以通过以下模型得到最好的解释：在模型中，13-20个太阳质量超级巨星几乎失去了整个氢包层，成为一个紧密的双星同伴，产生了“ IIb型”超新星，但是为此假设了巨大的伴星迄今为止，尚无一类超新星发现。在这里，我们报告了爆​​炸十年后SN1993J的光度学和光谱学观察。在衰落的超新星的位置，我们检测到了一颗巨大恒星的明确特征：祖先的双星伴星。

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