论文标题
S型星在Lamost DR9的中分辨率光谱中发现的S型星
S-type stars discovered in Medium-Resolution Spectra of LAMOST DR9
论文作者
论文摘要
在本文中，我们报告了606个S型恒星，这些恒星从Lamost中分辨率光谱（MRS）调查的数据释放9中鉴定出来，首次报道了其中539个。这些恒星的发现是一个三步的过程，即使用大于0.25的ZRO频带索引选择，不包括具有迭代支持向量机方法的非S型恒星，最后保留了大于-7.1的绝对强度幅度幅度的恒星。 606恒星与颜色标记图中已知的S型恒星的分布一致。我们使用Apogee和S型恒星的MARCS模型[C/Fe]和[O/Fe]估算了C/O，并且两种方法的结果表明，全恒星的C/OS大于0.5。颜色标记图和C/OS上的位置都进一步验证了我们的S型样品的性质。通过样品研究TIO和大气参数对ZRO的影响，我们发现Log G对ZRO的影响比Teff和[Fe/H]具有更大的影响，并且TIO和LOG G均可能与ZRO负相关。根据Tian等人的标准。 （2020年），零点校准的径向速度从Lamost MRS的正式目录和Zhang等人的目录中发现了238个二元候选。 （2021）。以下链接可获得这606个S型星的目录https://doi.org/10.12149/101097。
In this paper, we report on 606 S-type stars identified from Data Release 9 of the LAMOST medium-resolution spectroscopic (MRS) survey, and 539 of them are reported for the first time. The discovery of these stars is a three-step process, i.e., selecting with the ZrO band indices greater than 0.25, excluding non-S-type stars with the iterative Support Vector Machine method, and finally retaining stars with absolute bolometric magnitude larger than -7.1. The 606 stars are consistent with the distribution of known S-type stars in the color-magnitude diagram. We estimated the C/Os using the [C/Fe] and [O/Fe] provided by APOGEE and the MARCS model for S-type stars, respectively, and the results of the two methods show that C/Os of all stars are larger than 0.5. Both the locations on the color-magnitude diagram and C/Os further verify the nature of our S-type sample. Investigating the effect of TiO and atmospheric parameters on ZrO with the sample, we found that log g has a more significant impact on ZrO than Teff and [Fe/H], and both TiO and log g may negatively correlate with ZrO. According to the criterion of Tian et al. (2020), a total of 238 binary candidates were found by the zero-point-calibrated radial velocities from the officially released catalog of LAMOST MRS and the catalog of Zhang et al. (2021). A catalog of these 606 S-type stars is available from the following link https://doi.org/10.12149/101097.
