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arXiv 0910.2275astro-ph.SR
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关于NGC 4603中II型高原SN 2008 cn的前身

On the Progenitor of the Type II-Plateau SN 2008cn in NGC 4603

N. Elias-Rosa, S. D. Van Dyk, W. Li, N. Morrell, S. Gonzalez, M. Hamuy, A. V. Filippenko, J. -C. Cuillandre, R. J. Foley, N. Smith

摘要:

通过比较哈勃太空望远镜上的宽视场和行星照相机2获得的爆炸前和爆炸后的图像,我们已经分离出一颗爆炸前的超巨星,其位置与高光度SN II-P 2008cn几乎相同。我们提供的证据表明,这颗超巨星很可能是SN的祖先,尽管这一鉴定并不完全明确,主要是由于到宿主星系(NGC 4603)的距离为33.3 Mpc。这颗候选的祖先恒星比一般预期的颜色更黄,如果它是一颗恒星,那么它就需要在“蓝环”进化阶段爆炸。尽管如此,我们估计这颗恒星的初始质量为Mini = 15 +/-2 Msun,这在SN II-P祖星的预期质量范围内。较黄的颜色也可能来自两颗或更多恒星的混合,例如一颗红色的超巨星被一颗更明亮的蓝色超巨星所隐藏;或者一个大质量的相互作用的双星系统。最后,如果黄超巨星不是祖先星,或者不是恒星混合星或包含祖先星的双星,那么我们将任何未被发现的祖先星限制为Mini <11 Msun的红超巨星,考虑到旋转恒星在模型端点光度处爆炸的物理更现实的场景。(简略)

英文摘要:

Through comparison of pre- and post-explosion images obtained with the Wide Field and Planetary Camera 2 onboard the Hubble Space Telescope, we have isolated a supergiant star prior to explosion at nearly the same position as the high-luminosity SN II-P 2008cn. We provide evidence that this supergiant may well be the progenitor of the SN, although this identification is not entirely unambiguous due mainly to the distance to the host galaxy (NGC 4603), 33.3 Mpc. The progenitor candidate has a more yellow color than generally would be expected and, if a single star, would require that it exploded during a "blue loop" evolutionary phase. Nonetheless, we estimate an initial mass of Mini = 15 +/- 2 Msun for this star, which is within the expected mass range for SN II-P progenitors. The yellower color could also arise from the blend of two or more stars, such as a red supergiant hidden by a brighter, blue supergiant; or a massive, interacting binary system. Finally, if the yellow supergiant is not the progenitor, or is not a stellar blend or binary containing the progenitor, then we constrain any undetected progenitor star to be a red supergiant with Mini < 11 Msun, considering a physically more realistic scenario of explosion at the model endpoint luminosity for a rotating star. (ABRIDGED)

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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