论文标题
追捕红色超级二进制文件：SMC的紫色光度法
Hunting for red supergiant binaries: UVIT photometry of the SMC
论文作者
论文摘要
我们介绍了小云星系（SMC）的RSG群体的紫外线/Astrosat UV光度法。由于RSG在Far-UV中非常微弱，因此这些观察值直接探测潜在的伴随星。从861个SMC RSG的样品中，我们发现88个在远处波长的检测：明确的二进制特征。确定两个组件的恒星参数，这使我们能够首次研究RSG二进制系统的质量比率（Q）分布。我们发现一个扁平的质量比率分布最能描述到M {RSG} 〜15 msun的观测值。我们说明了我们的主要观察偏差（即紫外调查的限制幅度），以确定在0.3 <q <q <1.0和轨道周期范围内的固有RSG二元分数为18.8 +/- 1.5％，大约在3 <log p [days] <8。
We present UVIT/Astrosat UV photometry of the RSG population of the Small Cloud galaxy (SMC). As RSGs are extremely faint in the far-UV, these observations directly probe potential companion stars. From a sample of 861 SMC RSGs, we find 88 have detections at far-UV wavelengths: a clear signature of binarity. Stellar parameters are determined for both components, which allows us to study - for the first time - the mass-ratio (q) distribution of RSG binary systems. We find a flat mass-ratio distribution best describes the observations up to M{RSG}~15 Msun. We account for our main observing bias (i.e. the limiting magnitude of the UVIT survey) to determine the intrinsic RSG binary fraction of 18.8+/-1.5 %, for mass-ratios in the range 0.3 < q < 1.0 and orbital periods approximately in the range 3 < log P[ days] < 8.
