论文标题
Orion OB1关联中广泛的预选前序列二进制的统计数据
Statistics of wide pre-main sequence binaries in the Orion OB1 association
论文作者
论文摘要
使用来自Gaia的Vista Orion Mini-Survey和Astromentry的图像，研究了ORION OB1关联中低质量前序列二进制二进制二进制的统计数据（在370 PC时为220至7400 au）。基于CVSO目录的输入样品包含1137颗K和M光谱类型的恒星（质量为0.3至0.9 msun），其中1021个被认为是关联成员。这些恒星有135个物理二元伴侣，质量比高于〜0.13。在1.2年的分离中，平均伴侣分数为0.09+-0.01，略小于但仍然与该场一致。我们发现ORI OB1A和OB1B组之间存在差异，后者的二进制因素更丰富1.6+-0.3。宽二元频率对观察到的基础恒星密度的总体依赖性尚未发现，尽管在ORI OB1A云云中，这些二进制文件似乎避免了密集的簇。 ORI OB1和金牛座等稀疏地区的多重性速率有很大差异，暗示该田间的二进制可能源于不同种群的混合物。
Statistics of low-mass pre-main sequence binaries in the Orion OB1 association with separations ranging from 0.6" to 20" (220 to 7400 au at 370 pc) are studied using images from the VISTA Orion mini-survey and astrometry from Gaia. The input sample based on the CVSO catalog contains 1137 stars of K and M spectral types (masses between 0.3 and 0.9 Msun), 1021 of which are considered to be association members. There are 135 physical binary companions to these stars with mass ratios above ~0.13. The average companion fraction is 0.09+-0.01 over 1.2 decades in separation, slightly less than, but still consistent with, the field. We found a difference between the Ori OB1a and OB1b groups, the latter being richer in binaries by a factor 1.6+-0.3. No overall dependence of the wide-binary frequency on the observed underlying stellar density is found, although in the Ori OB1a off-cloud population these binaries seem to avoid dense clusters. The multiplicity rates in Ori OB1 and in sparse regions like Taurus differ significantly, hinting that binaries in the field may originate from a mixture of diverse populations.
