HD 165054:钡窗中用于高对比度成像仪的天体测量校准场
天体物理仪器与方法
2020-05-13 v1 地球与行星天体物理
摘要
我们呈现对 HD 165054 天体测量校准场的研究,该场已被 Gemini 行星成像仪(GPI)周期性观测。HD 165054 是钡窗(Baade's Window)内的一颗亮星,钡窗是银道面中星际尘埃消光相对较低的区。HD 165054 因该区域内恒星数密度高(在 时约每平方角秒 3 颗星)而被选为校准目标,这对于 GPI 的小视场是必要的。利用跨越五年以上的九个历元,我们对 HD 165054 邻近(角距离 角秒)的七颗背景星的天体测量拟合了标准五参数天体测量模型。我们实现了约 0.3 mas/yr 的自行精度,并将每颗星视差限制为 mas。我们测得的自行和视差极限与背景星属于银河系核球一致。利用这些测量,我们发现 2014 至 2019 年间 GPI 的板比例尺或北角偏移均无系统性趋势的证据。我们将描述七颗背景星运动的模型与 2014 和 2018 年用 Keck/NIRC2(一台具有优异天体测量校准的仪器)获得的同一场观测进行比较。我们发现背景源的预测位置与 NIRC2 所测位置一致,在两种仪器校准的不确定性范围内。未来,我们将使用该场作为 GPI 升级及潜在其他高对比度成像仪的标准天体测量校准场。
引用
@article{arxiv.2004.02923,
title = {HD 165054: an astrometric calibration field for high-contrast imagers in Baade's Window},
author = {Meiji M. Nguyen and Robert J. De Rosa and Jason J. Wang and Thomas M. Esposito and Paul Kalas and James R. Graham and Bruce Macintosh and Vanessa P. Bailey and Travis Barman and Joanna Bulger and Jeffrey Chilcote and Tara Cotten and Rene Doyon and Gaspard Duchêne and Michael P. Fitzgerald and Katherine B. Follette and Benjamin L. Gerard and Stephen J. Goodsell and Alexandra Z. Greenbaum and Pascale Hibon and Justin Hom and Li-Wei Hung and Patrick Ingraham and Quinn Konopacky and James E. Larkin and Jérôme Maire and Franck Marchis and Mark S. Marley and Christian Marois and Stanimir Metchev and Maxwell A. Millar-Blanchaer and Eric L. Nielsen and Rebecca Oppenheimer and David Palmer and Jennifer Patience and Marshall Perrin and Lisa Poyneer and Laurent Pueyo and Abhijith Rajan and Julien Rameau and Fredrik T. Rantakyrö and Bin Ren and Jean-Baptiste Ruffio and Dmitry Savransky and Adam C. Schneider and Anand Sivaramakrishnan and Inseok Song and Remi Soummer and Melisa Tallis and Sandrine Thomas and J. Kent Wallace and Kimberly Ward-Duong and Sloane Wiktorowicz and Schuyler Wolff},
journal= {arXiv preprint arXiv:2004.02923},
year = {2020}
}
备注
25 pages, 12 figures