麦哲伦云中大质量恒星的2dF-AAO兆光谱学：大麦云云东北区
2dF-AAOmega spectroscopy of massive stars in the Magellanic Clouds: The north-eastern region of the Large Magellanic Cloud
摘要：
我们目前的光谱分类从光学光谱的263个大质量恒星在东北地区的大麦云云。观测到的2度场包括巨大的剑鱼座30恒星形成区，SN 1987 A的周围地区，以及剑鱼座30以南的一些恒星形成复合体。这是大多数恒星（203颗）的第一次分类，包括11颗双线分光双星。该样品还包括早期OC型光谱的第一个例子（AAOmega 30 Dor 248和280），其氮光谱的弱点和C IV 4658发射区分。我们建议，这些恒星有相对未加工的CNO丰度相比，形态正常的O型恒星，指示一个较早的演化阶段。通过对连续两个晚上观测结果的分析，我们对233颗恒星的径向速度进行了估计，发现了一个明显的单线双星和9个（> 3 sigma）与系统速度相比的异常值;后者可能是逃逸星或大振幅双星系统，需要进一步的光谱学来研究它们的性质。
英文摘要：
We present spectral classifications from optical spectroscopy of 263 massive stars in the north-eastern region of the Large Magellanic Cloud. The observed two-degree field includes the massive 30 Doradus star-forming region, the environs of SN1987A, and a number of star-forming complexes to the south of 30 Dor. These are the first classifications for the majority (203) of the stars and include eleven double-lined spectroscopic binaries. The sample also includes the first examples of early OC-type spectra (AAOmega 30 Dor 248 and 280), distinguished by the weakness of their nitrogen spectra and by C IV 4658 emission. We propose that these stars have relatively unprocessed CNO abundances compared to morphologically normal O-type stars, indicative of an earlier evolutionary phase. From analysis of observations obtained on two consecutive nights, we present radial-velocity estimates for 233 stars, finding one apparent single-lined binary and nine (>3sigma) outliers compared to the systemic velocity; the latter objects could be runaway stars or large-amplitude binary systems and further spectroscopy is required to investigate their nature.
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