Tycho-B: an unlikely companion for SN 1572*
Tycho-B: an unlikely companion for SN 1572*
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DOI：
10.1093/mnras/sty1863
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发表时间：
2018-03
影响因子：
4.8
通讯作者：
W. E. Kerzendorf;K. Long;P. Winkler;T. Do
中科院分区：
文献类型：
--
作者：
W. E. Kerzendorf;K. Long;P. Winkler;T. Do
如果部分或全部Ia型超新星是由伴星吸积到大质量WD上而产生的，那么伴星在超新星爆炸后将保持某种形式。第谷-B是一颗不寻常的、相对较热的星星，沿着第谷的SNR的视线--最终被证明是Ia型--并被认为是这样的伴星。如果第谷的SNR内部含有未受冲击的Fe，并且如果第谷-B在SNR壳层内或背景中，那么人们可能希望在紫外光谱中看到这一点的证据。SN 1006的情况就是这样，背景Schweizer-Middleditch星星和两个活动星系核的光谱显示出Fe II的宽吸收线。为了验证这个想法，我们在HST上使用STIS获得了Tycho-B的紫外光谱。然而，观察到的光谱没有显示出Fe II吸收的证据。此外，使用紫外和光谱的Tycho-B的光度距离估计表明，该星星与前景闯入者一致。我们的结论是，第谷B比第谷的SNR更近，或者所有的铁在第谷的SNR内部更高度电离。
If some or all Type Ia SNe arise from accretion onto a massive WD from a companion, then the companion will remain in some form after the SN explosion. Tycho-B is an unusual, relatively hot star along the line of sight to Tycho's SNR -- conclusively shown to be a Type Ia -- and has been suggested as such a companion. If the interior of Tycho's SNR contains unshocked Fe, and if Tycho-B is either within the SNR shell or in the background, then one might hope to see evidence of this in the UV spectrum. Such is the case for SN\,1006, where spectra of the background Schweizer-Middleditch star, as well as two AGNs, show broad absorption lines of Fe II. To test this idea, we have used STIS on HST to obtain a UV spectrum of Tycho-B. The observed spectrum, however, shows no evidence of Fe II absorption. Furthermore, a luminosity distance estimate using UV and optical spectra of Tycho-B suggests that the star is consistent with a foreground interloper. We conclude either that Tycho B is nearer than Tycho's SNR, or that all of the Fe in the interior of Tycho's SNR is more highly ionized.