船底座星云- VII中X兆目标的光谱学关于Tr 16-112、HD 93343和HD 93250的多重数
Optical spectroscopy of X-Mega targets in the Carina nebula - VII On the multiplicity of Tr 16-112, HD 93343 and HD 93250
摘要：
我们提出的光谱监测活动的结果，致力于三个O型星的船底座星云。我们导出了一个特殊的不对称双星系统Tr 16-112的完整的SB 2轨道解，该系统由O 5.5 - 6 V（（f $^+$？p））小学和B2 V-III中学。我们还报告了Tr 16-112中的低振幅亮度变化，这可能是由于O5.5-6主要围绕系统质心的偏心轨道旋转的椭圆形。我们第一次在HD 93343（O 8 + O 8）的光谱中检测到一个清晰的SB 2双星信号，尽管我们的数据不足以建立轨道解。该系统还显示低振幅光度调制。另一方面，在HD 93250的光谱中没有发现多重性的迹象。最后，我们讨论了船底座OB 1星协中多颗大质量恒星的一般性质。
英文摘要：
We present the results of a spectroscopic monitoring campaign devoted to three O-type stars in the Carina nebula. We derive the full SB2 orbital solution of the binary system Tr 16-112, an exceptional dissymmetrical system consisting of an O5.5-6V((f$^+$?p)) primary and a B2V-III secondary. We also report on low-amplitude brightness variations in Tr 16-112 that are likely due to the ellipsoidal shape of the O5.5-6 primary revolving in an eccentric orbit around the system's centre of mass. We detect for the first time a clear SB2 binary signature in the spectrum of HD 93343 (O8 + O8), although our data are not sufficient to establish an orbital solution. This system also displays low amplitude photometric modulations. On the other hand, no indication of multiplicity is found in the optical spectra of HD 93250. Finally, we discuss the general properties of multiple massive stars in the Carina OB1 association.
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