WFPC2 Imaging of the Circumstellar Nebulosity of HL Tauri
WFPC2 Imaging of the Circumstellar Nebulosity of HL Tauri
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HL Tauri 星周星云的 WFPC2 成像
DOI：
10.1086/176106
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
J. Westphal
中科院分区：
文献类型：
--
作者：
K. Stapelfeldt;C. Burrows;J. Krist;J. Trauger;J. Hester;J. Holtzman;G. Ballester;S. Casertano;J. Clarke;D. Crisp;R. Evans;J. Gallagher;R. Griffiths;J. Hoessel;J. Mould;P. Scowen;A. Watson;J. Westphal
翻新后的哈勃太空望远镜上搭载的广角2号行星相机通过V、R和I波段滤光片获得了金牛座HL行星相机的图像。这些图像显示，HL金牛座星云在光学波长上完全是反射星云，在V=25.5的极限星等下看不到光学恒星。该光学星云沿着HL-Tau的光学喷流方向向恒星位置的东北方向延伸，并具有不同寻常的C形形态。明亮的星云核心只有1英寸大小，中心距离实际恒星位置只有1“2英寸。我们估计，对不可见点源的视觉消光至少为22mag，恒星光球层光度至少为3 L_☉。这些发现证实了其他证据，即这颗恒星比典型的T金牛座恒星更年轻，更深入。
Planetary camera images of HL Tauri have been obtained through V-, R-, and I-band filters using the Wide Field and Planetary Camera 2 aboard the refurbished Hubble Space Telescope. These images show that HL Tauri is entirely reflection nebulosity at optical wavelengths, with no optical star visible to a limiting magnitude of V = 25.5. The optical nebula extends northeast of the stellar position along the direction of HL Tau's optical jet and has an unusual C-shaped morphology. The bright core of the nebula is only 1" in size and is centered only 1".2 from the actual stellar position. We estimate that visual extinction toward the unseen point source is at least 22 mag and that the stellar photospheric luminosity must be at least 3 L_☉. These findings corroborate other evidence that this star is significantly younger and more embedded than typical T Tauri stars.