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arXiv 1809.10071astro-ph.SR
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双星红超巨星:探测B型伴星的新方法

Binary Red Supergiants: A New Method for Detecting B-type Companions

Kathryn F. Neugent, Emily M. Levesque, Phil Massey

摘要:

除了少数已知和研究过的系统外,红超巨星(RSG)的双星群体仍然相对缺乏特征。着名的系统,如VV Cep,31 Cyg和zeta Aur包含RSG + B星双星,在这里,我们将探讨B星是否是我们从进化的角度期待的主要类型的伴侣。使用日内瓦的进化模型,我们发现,这确实是这样的。然而,很少有这样的系统是已知的,我们使用模型光谱,以确定如何容易这样的二进制将是观测检测。我们发现,它应该是相当困难的,以隐藏一个B-型伴星在光谱的光学/蓝色部分给出了合理的信噪比。接下来,我们检查麦哲伦云RSG的光谱和新获得的银河系RSG的光谱,寻找新的系统,并完善我们关于光谱中可能隐藏的恒星类型的结论。最后,我们开发了一套光度标准,可以帮助选择可能的双星在未来没有大型定期或光谱调查的开销。

英文摘要:

With the exception of a few well-known and studied systems, the binary population of red supergiants (RSGs) remains relatively uncharacterized. Famous systems such as VV Cep, 31 Cyg and zeta Aur contain RSG + B star binaries and here we explore whether B stars are the main type of companion we expect from an evolutionary point of view. Using the Geneva evolutionary models we find that this is indeed the case. However, few such systems are known, and we use model spectra to determine how easy such binaries would be to detect observationally. We find that it should be quite difficult to hide a B-type companion given a reasonable signal-to-noise in the optical / blue portion of the spectrum. We next examine spectra of Magellanic Cloud RSGs and newly acquired spectra of Galactic RSGs looking for new systems and refining our conclusions about what types of stars could be hidden in the spectra. Finally, we develop a set of photometric criteria that can help select likely binaries in the future without the overhead of large periodic or spectroscopic surveys.

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