寻找新的黄色共生星：StHa63的阳性鉴定
Searching for new yellow symbiotic stars: positive identification of StHa63
摘要：
黄色共生星是探测这些双星系统中是否发生质量转移的有用目标。然而，已知的黄色共生星的数量非常稀少。我们报告的光谱观测的五个候选人黄色共生星选择他们的位置在2 MASS（J-H）与（H-Ks）图，并包括在一些发射线目录。在五颗候选星中，只有StHa 63被认为是一颗新的黄色共生星，因为它的光谱和它在[TiO]1-[TiO]2图中的位置表明它的光谱类型是K4-K6。此外，导出的电子密度（10E8.4 cm-3）和几个发射线强度比提供了进一步的支持，分类。其他四个候选者被拒绝为共生星，因为其中三个实际上没有发射线，第四个只显示巴尔末发射线。我们还发现，WISE W3-W 4指数清楚地将正常的K巨星与黄色共生星区分开来，因此可以用作选择候选黄色共生星的额外工具。
英文摘要：
Yellow symbiotic stars are useful targets to probe whether mass transfer has happened in these binary systems. However, the number of known yellow symbiotic stars is very scarce. We report spectroscopic observations of five candidate yellow symbiotic stars selected by their position in the 2MASS (J-H) vs. (H-Ks) diagram and included in some emission-line catalogs. Among the five candidates, only StHa63 is identified as a new yellow symbiotic star because of its spectrum and its position in the [TiO]1-[TiO]2 diagram that indicates a K4-K6 spectral type. In addition, the derived electron density (10E8.4 cm-3) and several emission line intensity ratios provide further support for that classification. The other four candidates are rejected as symbiotic stars because three of them actually do not show emission lines and the fourth one shows only Balmer emission lines. We also found that the WISE W3-W4 index clearly separates normal K-giants from yellow symbiotic stars and, therefore, can be used as an additional tool to select candidate yellow symbiotic stars.
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