论文标题
用HST/STIS的近距离视觉二进制的空间分辨光谱：I。七个O型系统
Spatially resolved spectroscopy of close massive visual binaries with HST/STIS: I. Seven O-type systems
论文作者
论文摘要
语境。许多O型恒星都有附近的同伴，它们的存在通过光谱妨碍了他们的特征。 目标。我们希望获得近距离O型视觉二进制的空间分辨光谱，以得出它们的光谱类型。 方法。我们使用哈勃太空望远镜（HST）的空间望远镜成像光谱仪（STIS）获得八个带有附近视觉伴侣的八个银河O型星的长缝蓝色紫色光谱，并使用空间profile拟合来提取单独的光谱。我们还使用基于地面的银河O-Star光谱调查（GOSS）来研究更遥远的视觉组件。 结果。我们在空间上解决了八个系统中的七个，它们的组件呈现光谱，并获得它们的光谱类型。那七个多个系统是Iota Ori AA，AB，B，15 Mon AA，AB，C，Tau CMA AA，AB，B，C，C，D，E，HD 206 267 AA，AB，C，C，C，D，HD 193 443 A，B，HD 16 429 429 AA，AB，AB和IU AUR AUR AUR AUR A，b。这是第一次获得这些系统的近距离视觉二进制的空间分辨光谱。我们建立了该技术的适用性，这是二进制的分离和幅度差异的函数。
CONTEXT. Many O-type stars have nearby companions whose presence hamper their characterization through spectroscopy. AIMS. We want to obtain spatially resolved spectroscopy of close O-type visual binaries to derive their spectral types. METHODS. We use the Space Telescope Imaging Spectrograph (STIS) of the Hubble Space Telescope (HST) to obtain long-slit blue-violet spectroscopy of eight Galactic O-type stars with nearby visual companions and use spatial-profile fitting to extract the separate spectra. We also use the ground-based Galactic O-Star Spectroscopic Survey (GOSSS) to study more distant visual components. RESULTS. We spatially resolve seven of the eight systems, present spectra for their components, and obtain their spectral types. Those seven multiple systems are iota Ori Aa,Ab,B, 15 Mon Aa,Ab,C, tau CMa Aa,Ab,B,C,D,E, HD 206 267 Aa,Ab,C,D, HD 193 443 A,B, HD 16 429 Aa,Ab, and IU Aur A,B. This is the first time that spatially resolved spectroscopy of the close visual binaries of those systems is obtained. We establish the applicability of the technique as a function of the separation and magnitude difference of the binary.
