The Multiple Young Stellar Objects of HBC 515: An X-ray and Millimeter-wave Imaging Study in (Pre-main Sequence) Diversity
The Multiple Young Stellar Objects of HBC 515: An X-ray and Millimeter-wave Imaging Study in (Pre-main Sequence) Diversity
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HBC 515 的多个年轻恒星天体：（前主序）分集的 X 射线和毫米波成像研究
DOI：
10.1051/0004-6361/201629545
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
G. Micela
中科院分区：
文献类型：
--
作者：
D. Principe;G. Sacco;J. Kastner;D. Wilner;B. Stelzer;G. Micela
我们介绍了钱德拉X射线天文台和亚毫米波阵列（SMA）成像的HBC 515，一个系统，由多个年轻的恒星物体（YSO）。HBC 515的五个成员代表了一个非常多样化的YSO阵列，从低质量的I/II类原恒星HBC 515 B，到II类和过渡盘对象（分别为HBC 515 D和C），再到“无盘”，中等质量，前主序星双星HBC 515 A。我们的钱德拉/ACIS成像确定所有五个组件都是X射线源，HBC 515 A-一个亚角秒分离的双星，被钱德拉部分解析-是主要的X射线源。我们探测到与HBC 515 B有关的X射线耀斑。在SMA成像中，HBC 515 B被检测为强的1.3 mm连续谱发射源;第二个较弱的mm连续谱源与过渡盘物体HBC 515 C的位置重合。这些结果有力地支持了HBC 515 B的原恒星性质，并坚定地确立了HBC 515 A是罕见的相对大质量、X射线发光的“弱线金牛T星”的成员，它们是双星，在MS前演化的早期阶段就已经脱落了它们的盘。两个这样不同的对象共存于一个单一的，大概是同时代的多个YSO系统突出了前MS星星质量的影响，双星，和X射线光度在调节拱星，行星形成磁盘的寿命和星盘相互作用的时间尺度。
We present Chandra X-ray Observatory and Submillimeter Array (SMA) imaging of HBC 515, a system consisting of multiple young stellar objects (YSOs). The five members of HBC 515 represent a remarkably diverse array of YSOs, ranging from the low-mass Class I/II protostar HBC 515B, through Class II and transition disk objects (HBC 515D and C, respectively), to the "diskless", intermediate- mass, pre-main sequence binary HBC 515A. Our Chandra/ACIS imaging establishes that all five components are X-ray sources, with HBC 515A - a subarcsecond-separation binary that is partially resolved by Chandra - being the dominant X-ray source. We detect an X-ray flare associated with HBC 515B. In the SMA imaging, HBC 515B is detected as a strong 1.3 mm continuum emission source; a second, weaker mm continuum source is coincident with the position of the transition disk object HBC 515C. These results strongly support the protostellar nature of HBC 515B, and firmly establish HBC 515A as a member of the rare class of relatively massive, X-ray luminous "weak-lined T Tauri stars" that are binaries and have shed their disks at very early stages of pre-MS evolution. The coexistence of two such disparate objects within a single, presumably coeval multiple YSO system highlights the influence of pre- MS star mass, binarity, and X-ray luminosity in regulating the lifetimes of circumstellar, planet-forming disks and the timescales of star-disk interactions.
DOI：
10.1088/0004-637x/804/1/29
发表时间：
2015-02
期刊：
The Astrophysical Journal
影响因子：
--
作者：
U. Gorti;D. Hollenbach;C. Dullemond
通讯作者：
U. Gorti;D. Hollenbach;C. Dullemond