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arXiv 1502.07096astro-ph.SR
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HD188112:超新星Ia的祖先?

HD188112: Supernova Ia progenitor?

M. Latour, A. Irrgang, U. Heber, V. Schaffenroth

摘要:

HD 188112是一颗质量极低的白矮星。根据先前的研究,HD 188112的质量是$\sim$ 0.24兆太阳能,而它看不见的伴星(一个紧凑的简并天体)的质量下限为0.73兆太阳能。我们利用HST STIS光谱测量了HD 188112中紫外金属线的转动展宽,以便对其伴星的质量施加更严格的约束。通过假设中的系统是同步旋转的,我们得到一个伴星质量在1.05和1.25 Msun之间。我们还测量了镁、硅和铁的丰度,分别为log $N$(X)/ $N$(H)= $-$ 6.40、$-$ 7.25和$-$ 5.81。从紫外光谱测量的径向速度被发现是在非常好的协议与预测的基础上的轨道参数在以前的研究中提出了十年前。

英文摘要:

HD188112 is an extremely low mass white dwarf in a close binary system. According to a previous study, the mass of HD188112 is $\sim$0.24 Msun and a lower limit of 0.73 Msun could be put for the mass of its unseen companion, a compact degenarate object. We used HST STIS spectra to measure the rotational broadening of UV metallic lines in HD188112, in order to put tighter constraints on the mass of its companion. By assuming that the system in is synchronous rotation, we derive a companion mass between 1.05 and 1.25 Msun. We also measure abundances for magnesium, silicon, and iron, respectively log $N$(X)/$N$(H) = $-$6.40, $-$7.25, and $-$5.81. The radial velocities measured from the UV spectra are found to be in very good agreement with the prediction based on the orbital parameters derived in the previous study made a decade ago.

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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