论文标题
对狼疮综合体中的情节磁盘进行的广泛调查
A wide survey for circumstellar disks in the Lupus complex
论文作者
论文摘要
以前的恒星形成研究出于必要性，通常定义了限制分子云附近的年轻恒星群。盖亚（Gaia）允许我们检查附近恒星形成区域的更广泛的三维结构，从而对其历史有了新的了解。我们提出了一个大区域的调查，涵盖了狼疮复合体的494平方英尺，这是一个原型的低质量恒星形成区域。我们的调查包括该区域中的所有已知分子云以及SCO-CEN复合体的上半分裂（美国）和上城狼疮（UCL）组的部分。我们将Gaia DR2的适当运动和视差结合在一起，以及与磁盘选择年轻恒星对象（YSOS）的共同中海光度法。 YSO年龄是从Gaia颜色标记图中推断出来的，它们的进化阶段是从光谱能量分布的斜率上推断出来的。我们发现98个新的含盘源。我们的新样本包括年龄为1至15个MYR的物体，质量为0.05至0.5太阳能，由56个具有较厚磁盘的来源和42个带有贫血磁盘的来源组成。尽管最小的成员集中在云层中，并且在160 pc的距离上，但恒星的分布人群在适当的运动，空间分布，距离和年龄与狼疮和UCL组重叠。新的带有磁盘的YSO的空间和运动学特性表明，狼疮和UCL不是不同的组。我们的新样本包括在这些年龄段的一些最近的磁盘，因此为磁盘和质量恒星的后续研究提供了一个重要目标，例如使用ALMA和ESO-VLT X-SHOOTER。
Previous star formation studies have, out of necessity, often defined a population of young stars confined to the proximity of a molecular cloud. Gaia allows us to examine a wider, three-dimensional structure of nearby star forming regions, leading to a new understanding of their history. We present a wide-area survey covering 494 square degrees of the Lupus complex, a prototypical low-mass star forming region. Our survey includes all known molecular clouds in this region as well as parts of the Upper Scorpius (US) and Upper Centaurus Lupus (UCL) groups of the Sco-Cen complex. We combine Gaia DR2 proper motions and parallaxes as well as ALLWISE mid-infrared photometry to select young stellar objects (YSOs) with disks. The YSO ages are inferred from Gaia color-magnitude diagrams, and their evolutionary stages from the slope of the spectral energy distributions. We find 98 new disk-bearing sources. Our new sample includes objects with ages ranging from 1 to 15 Myr and masses ranging from 0.05 to 0.5 solar masses , and consists of 56 sources with thick disks and 42 sources with anemic disks. While the youngest members are concentrated in the clouds and at distances of 160 pc, there is a distributed population of slightly older stars that overlap in proper motion, spatial distribution, distance, and age with the Lupus and UCL groups. The spatial and kinematic properties of the new disk-bearing YSOs indicate that Lupus and UCL are not distinct groups. Our new sample comprises some of the nearest disks to Earth at these ages, and thus provides an important target for follow-up studies of disks and accretion in very low mass stars, for example with ALMA and ESO-VLT X-Shooter.
