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arXiv 2312.04787astro-ph.SR
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利用 ESO 观测的五个疏散星团中的自转速度搜索光谱双星

Search for spectroscopic binaries using rotational velocities in five open clusters observed by ESO

Mikhail Kovalev, Mariyam Ahmed, Randa Asa'd

AI总结:

提出利用单星模型拟合时的高投影自转速度识别双线光谱双星,并在 ESO 观测的五个疏散星团中发现 60 个候选体,其中 42 个为新候选。

摘要:

本文中,我们在五个疏散星团——NGC 2243、NGC 2420、NGC 3532、NGC 6253 和 NGC 6705(M 11)——中探测双线光谱双星(SB2),所用方法基于单星光谱模型拟合时投影自转速度的高值。观测光谱来自 ESO 档案。该方法在单星和双星的合成光谱集上进行了验证。如果双星成员自转缓慢且视向速度分离足够大,它能够可靠地选出光谱双星,而不会将其与单星混淆。我们发现了 60 个 SB2 候选体:NGC 2243 中 2 个,NGC 2420 和 NGC 3532 中各 8 个,NGC 6253 中 17 个,NGC 6705 中 25 个。与文献的比较确认了其中 18 个,因此我们发现了 42 个新的 SB2 候选体。

英文摘要:

In this paper we detect double-lined spectroscopic binaries (SB2) in five open clusters: NGC 2243, NGC 2420, NGC 3532, NGC 6253 and NGC 6705 (M 11) using a method based on high values of the projected rotational velocity when they are fitted with single star spectral model. Observed spectra were obtained from ESO archive. The method was validated on sets of synthetic spectra for the single and binary stars. It is able to reliably select spectroscopic binaries without confusing them with single stars, if components in binary rotate slowly and radial velocity separation is sufficiently high. We found 60 SB2 candidates: two in NGC~2243, eight in NGC~2420 and NGC~3532, 17 in NGC 6253 and 25 in NGC~6705. Comparison with literature confirms 18 of them, thus we found 42 new SB2 candidates.

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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