Probing discs around massive young stellar objects with CO first overtone emission
Probing discs around massive young stellar objects with CO first overtone emission
复制标题
利用二氧化碳第一泛音发射探测大质量年轻恒星周围的圆盘
DOI：
--
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
J. Urquhart
中科院分区：
文献类型：
--
作者：
H. Wheelwright;R. Oudmaijer;W. D. Wit;M. Hoare;S. Lumsden;J. Urquhart
我们提出了高分辨率（R = 50; 000）光谱天体测量的一个样本的7个中等/大质量的年轻恒星天体的CO 1阶泛音带头。这些主要是从红色MSX源（RMS）调查中得出的，这是对年轻大质量恒星的系统搜索，已经返回了大量精心挑选的此类天体样本。样本的平均光度约为5 × 10 4 L，表明这些物体的质量通常为15 M。我们适合所观察到的带头配置文件与一个模型的circums tellar光盘，并找到良好的协议之间的模型和观察，但一个对象。我们比较了高角精度（0：2 - 0：8 - 10 - 3角秒）的光谱天体测量数据与最佳拟合模型中发射物质的空间分布。检测到圆盘的N个空间特征，这与最佳拟合模型的性质完全一致。因此，观测结果表明，大质量年轻恒星天体的CO带头发射起源于小尺度盘，与以前的工作一致。这提供了进一步的证据，表明大质量恒星是通过盘吸积形成的，正如最近的模拟所建议的那样。
We present high resolution (R�50; 000) spectroastrometry over the CO 1 st overtone bandhead of a sample of seven intermediate/massive young stellar objects. These are primarily drawn from the red MSX source (RMS) survey, a systematic search for young massive stars which has returned a large, well selected sample of such objects. The mean luminosity of the sample is approximately 5� 10 4 L�, indicating the objects typically have a mass of� 15 M�. We fit the observed bandhead profiles with a model of a circums tellar disc, and find good agreement between the models and observations for all but one object. We compare the high angular precision (0: 2− 0: 8� 10 −3 arc-seconds) spectroastrometric data to the spatial distr ibution of the emitting material in the best-fitting models. N o spatial signatures of discs are detected, which is entirely consistent with the properties of the best-fitting models. Therefore, the observations suggest that the CO bandhead emission of massive young stellar objects originates in small-scale disks, in agreement with previous work. This provides further evidence that massive stars form via disc accretion, as suggested by recent simulations.
大质量年轻恒星W33A的星周盘、包膜和双极流出
DOI：
10.1111/j.1365-2966.2009.16077.x
发表时间：
2010
影响因子：
4.8
作者：
Davies B
通讯作者：
Davies B