论文标题
在Lamost DR8中鉴定出具有单衬里和复合光谱的热分子恒星
Hot subdwarf stars identified in LAMOST DR8 with single-lined and composite spectra
论文作者
论文摘要
222颗热的恒星用Lamost DR8光谱鉴定出来，其中131颗恒星显示复合光谱并已分解，而91颗恒星则具有单衬有光谱。所有样品恒星的大气参数均通过与合成光谱拟合氢（H）和氦（HE）线轮廓获得。通过将样品与GAIA DR3的非单个星形数据相结合，新发现了两个长期的复合SDB二进制文件。新系统之一呈现出已知的宽SDB二进制文件中最高的偏心率（即0.5 +/- 0.09），这超出了模型预测。 15综合SDB星星属于Ruwe-aen平面的高概率二元区域，应获得优先的随访观测值，以进一步研究其二元性质。在我们的复合谱样品中，在凉爽伴侣的温度中明显存在一个明显的差距。但是我们无法得出结论，在确认其二进制本性之前，此功能是否与热分子恒星的形成历史有关。
222 hot subdwarf stars were identified with LAMOST DR8 spectra, among which 131 stars show composite spectra and have been decomposed, while 91 stars present single-lined spectra. Atmospheric parameters of all sample stars were obtained by fitting Hydrogen (H) and Helium (He) line profiles with synthetic spectra. Two long-period composite sdB binaries were newly discovered by combining our sample with the non-single star data from Gaia DR3. One of the new systems presents the highest eccentricity (i.e., 0.5 +/- 0.09) among known wide sdB binaries, which is beyond model predictions. 15 composite sdB stars fall in the high probability binary region of RUWE-AEN plane, and deserve priority follow-up observations to further study their binary nature. A distinct gap is clearly presented among temperatures of cool companions for our composite-spectra sample. But we could not come to a conclusion whether this feature is connected to the formation history of hot subdwarf stars before their binary natures are confirmed.
