标题： 利用一种新的光谱分解方法确定大质量双星HDE 228766是否包含一个狼-Rayet星 显示英文标题

标题： Using a new spectral disentangling approach to ascertain whether the massive binary HDE 228766 contains a Wolf-Rayet star

摘要： 大质量双星HDE 228766由一颗O型主星和一颗演化中的次级星组成。 然而，之前对复合光谱的定性分析引发了关于次级星是Of星还是沃尔夫-拉叶星的广泛讨论。 我们利用新的观测数据和我们的QER20软件包首次分离了两颗恒星组分的光谱，并获得了无伪影重建的光谱，从而对主星进行了更准确和可靠的O7.5 V((f))z光谱分类，对次级星进行了O6 Iaf光谱分类。 次级星重建光谱中存在P-Cygni谱线轮廓的H\b{eta}和He I 5876 {\AA }线的发射特征表明，这颗恒星正处于向WN演化阶段过渡的初始阶段。 自2014年以来，在H{\gamma }吸收线之上观察到了一个以前未被发现的变化的发射特征，该特征至少由四个独立的特征组成。 我们的分析显示，这些发射特征起源于一个物理上扩展的区域。 这可以通过双星非保守演化过程中质量损失增强的事件来解释。 显示英文摘要

摘要： The massive binary HDE 228766 is composed of an O type primary and an evolved secondary. However, previous qualitative analyses of the composite spectrum have led to a wide discussion about whether the secondary is an Of or a Wolf-Rayet star. We use new observations and our novel QER20 package to disentangle for the first time the spectra of the two stellar components and obtain artefact free reconstructed spectra, yielding the more accurate and reliable spectral classifications of O7.5 V((f))z for the primary and O6 Iaf for the secondary. The emission features of the P-Cygni profiles of the H\b{eta} and He I 5876 {\AA} lines, present in the reconstructed spectrum of the secondary, show that this star is at an initial phase of its transition to the WN evolutionary stage. A previously unobserved variable emission, composed of at least four independent features, is seen since 2014 superposed to the H{\gamma} absorption line. Our analysis reveals that these emission features originate from a physically extended region. This could be explained by an episode of enhanced mass-loss in the scenario of a non conservative evolution of the binary.