论文标题

Orion星云群中M-Star多重种群的人口统计

Demographics of the M-star Multiple Population in the Orion Nebula Cluster

论文作者

De Furio, Matthew, Liu, Christopher, Meyer, Michael R., Reiter, Megan, Kraus, Adam, Dupuy, Trent, Monnier, John

论文摘要

我们介绍了对猎户座星云集群(ONC,高质量,高密度恒星形成区域)的恒星种群的限制的更新结果,遍布0.08-07m $ $ _ {\ odot} $。我们的研究利用了使用多个过滤器(GO-10246)进行调查的高级相机获得的档案哈勃太空望远镜数据。先前的多重性调查在低质量,低密度关联(如金牛座)中,对低质量恒星的伴侣过多的伴侣大约是银河场的两倍,并找到与该场一致的质量比分布。以前,我们发现ONC中低质量恒星的伴随频率与质量比= 0.6-1.0的银河场一致,并且预计的分离= 30-160AU,而没有对质量比分布的约束。在这项研究中,我们使用经验PSF模型研究了对大于10AU(0.025英寸)敏感的算法的ONC的伴侣人群。我们确定了44个同伴(14个新的)(14个新),并且具有贝叶斯分析,并在bayesian分析中估算了伴侣的频率,以估算plosecon频率,以估计0.0.0.0.0.0.0.0.0.0.0 $ 0。和质量比分布= 2.08 $^{+1.03} _ { - 0.85} $在所有质量比和预计的分离10-200AU中,我们发现ONC中的伴侣频率与高暂时的恒星态元素一致,并且与0.002的概率一致,与田地和金牛座一致,可能表明其原始性质,这是恒星形成过程的直接结果。

We present updated results constraining multiplicity demographics for the stellar population of the Orion Nebula Cluster (ONC, a high-mass, high-density star-forming region), across primary masses 0.08-0.7M$_{\odot}$. Our study utilizes archival Hubble Space Telescope data obtained with the Advanced Camera for Surveys using multiple filters (GO-10246). Previous multiplicity surveys in low-mass, low-density associations like Taurus identify an excess of companions to low-mass stars roughly twice that of the Galactic field and find the mass ratio distribution consistent with the field. Previously, we found the companion frequency to low-mass stars in the ONC is consistent with the Galactic field over mass ratios=0.6-1.0 and projected separations=30-160au, without placing constraints on the mass ratio distribution. In this study, we investigate the companion population of the ONC with a double point-spread function (PSF) fitting algorithm sensitive to separations larger than 10au (0.025") using empirical PSF models. We identified 44 companions (14 new), and with a Bayesian analysis, estimate the companion frequency to low-mass stars in the ONC =0.13$^{+0.05}_{-0.03}$ and the power law fit index to the mass ratio distribution =2.08$^{+1.03}_{-0.85}$ over all mass ratios and projected separations of 10-200au. We find the companion frequency in the ONC is consistent with the Galactic field population, likely from high transient stellar density states, and a probability of 0.002 that it is consistent with that of Taurus. We also find the ONC mass ratio distribution is consistent with the field and Taurus, potentially indicative of its primordial nature, a direct outcome of the star formation process.

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