论文标题
盐富含氦气热的盐调查：方法，分类和粗分析
The SALT survey of helium-rich hot subdwarfs: methods, classification, and coarse analysis
论文作者
论文摘要
正在使用南部非洲大型望远镜（SALT）进行中等和高分辨率的光谱调查。目的包括发现异国情调的热分子和连接不同类型的化学曲目的序列。第一阶段由从低分辨率调查中选择的100颗恒星的中分辨率光谱组成。本文描述了选择标准以及观察，分类和分析方法。它在类似于MK的钻孔系统上介绍了107个光谱分类，并基于基于零 - 金属非LTE和Line-Bline-Bland-Blanket的LTE LTE模型大气层的混合网格（$ t _ {\ rm eff}，\ log g，log y $）。对于75颗恒星，首次得出了大气参数。 The sample may be divided into 6 distinct groups including the classical `helium-rich' sdO stars with spectral types (Sp) sdO6.5 - sdB1 (74) comprising carbon-rich (35) and carbon-weak (39) stars, very hot He-sdO's with Sp $\lesssim$ sdO6 (13), extreme helium stars with luminosity class $\lesssim 5$ (5), intermediate helium-rich带有氦级25-35（8）和中级氦富的细分型和氦级$ 10-25 $（6）的中级富含氦气的细分。最后一个覆盖了狭窄的光谱范围（SDB0-SDB1），其中包括两个已知和四个候选重金属副标题。在其他小组内有几颗兴趣的恒星，包括极为金属贫困的氦气，候选双螺旋式二进制二进制组和候选人低重力HE-SDO恒星。
A medium- and high-resolution spectroscopic survey of helium-rich hot subdwarfs is being carried out using the Southern African Large Telescope (SALT). Objectives include the discovery of exotic hot subdwarfs and of sequences connecting chemically-peculiar subdwarfs of different types. The first phase consists of medium-resolution spectroscopy of over 100 stars selected from low-resolution surveys. This paper describes the selection criteria, and the observing, classification and analysis methods. It presents 107 spectral classifications on the MK-like Drilling system and 106 coarse analyses ($T_{\rm eff}, \log g, \log y$) based on a hybrid grid of zero-metal non-LTE and line-blanketed LTE model atmospheres. For 75 stars, atmospheric parameters have been derived for the first time. The sample may be divided into 6 distinct groups including the classical `helium-rich' sdO stars with spectral types (Sp) sdO6.5 - sdB1 (74) comprising carbon-rich (35) and carbon-weak (39) stars, very hot He-sdO's with Sp $\lesssim$ sdO6 (13), extreme helium stars with luminosity class $\lesssim 5$ (5), intermediate helium-rich subdwarfs with helium class 25 -- 35 (8), and intermediate helium-rich subdwarfs with helium class $10 - 25$ (6). The last covers a narrow spectral range (sdB0 -- sdB1) including two known and four candidate heavy-metal subdwarfs. Within other groups are several stars of individual interest, including an extremely metal-poor helium star, candidate double-helium subdwarf binaries, and a candidate low-gravity He-sdO star.
