Beta Pic 围绕 debris disk 的 HST/ACS 多波段腐蚀光学成像
摘要
（摘要已省略）我们报告了使用HST高级相机系统（ACS）获得的Beta Pic围绕 debris disk的F435W（B）、F606W（宽V）和F814W（宽I）腐蚀光学成像。我们确认，此前报告的内侧disk扭曲是一条与主disk倾斜约5度的次要disk。主disk的东北延伸从80到250 AU保持线性，但西南延伸在相同区域呈现约1 AU的明显弯曲。次要disk的两个延伸在80至150 AU范围内均呈线性，但并非共线。距离星体约120 AU内，主disk的厚度约为此前报告的50%。主disk脊线沿的表面亮度轮廓在40至250 AU之间拟合为四种不同的径向幂律，而次要disk在80至150 AU之间的轮廓拟合为单一幂律。这些差异表明两条disk可能具有不同的颗粒组成或尺寸分布。复合disk的F606W/F435W和F814W/F435W通量比关于投影轴的两个方向都呈非均匀且非对称。距离约120 AU内，主disk脊线上的m_F435W-m_F606W和m_F435W-m_F814W颜色分别比Beta Pic暗约10%和20%。这些颜色在超过120 AU后变得更红，到250 AU时分别比恒星暗约25%和40%。我们将观测到的120 AU内的红色颜色与模拟的非冰性颗粒颜色进行比较，这些颗粒具有约r^-3的径向数密度，考虑不同的组成、孔隙率和最小颗粒尺寸。观测到的颜色与compact或中等孔隙率的天文硅酸盐和/或石墨的颗粒尺寸>0.15-0.20 μm的颜色相符，但与预期的高孔隙率>90%颗粒的蓝色颜色不符。
引用
@article{arxiv.astro-ph/0602292,
title = {HST/ACS Multiband Coronagraphic Imaging of the Debris Disk around Beta Pictoris},
author = {D. A. Golimowski and D. R. Ardila and J. E. Krist and M. Clampin and H. C. Ford and G. D. Illingworth and F. Bartko and N. Benitez and J. P. Blakeslee and R. J. Bouwens and L. D. Bradley and T. J. Broadhurst and R. A. Brown and C. J. Burrows and E. S. Cheng and N. J. G. Cross and R. Demarco and P. D. Feldman and M. Franx and T. Goto and C. Gronwall and G. F. Hartig and B. P. Holden and N. L. Homeier and L. Infante and M. J. Jee and R. A. Kimble and M. P. Lesser and A. R. Martel and S. Mei and F. Menanteau and G. R. Meurer and G. K. Miley and V. Motta and M. Postman and P. Rosati and M. Sirianni and W. B. Sparks and H. D. Tran and Z. I. Tsvetanov and R. L. White and W. Zheng and A. W. Zirm},
journal= {arXiv preprint arXiv:astro-ph/0602292},
year = {2009}
}
备注
38 pages (including 21 figures and 4 tables) in EmulateApJ format, accepted for publication in The Astronomical Journal. Full-resolution figures and fully processed FITS images (with error maps) are available at http://acs.pha.jhu.edu/~dag/betapic Version 2: Added 4 references and some clarifying text. Basic facts and conclusions are unchanged