经典T Tauri星TW Hya二十五年吸积研究
太阳与恒星天体物理
2023-08-29 v1 地球与行星天体物理
摘要
吸积在原行星盘演化与消散所遵循的物理中起着核心作用。本文的主要目标是分析最近邻吸积太阳质量年轻星TW Hya的质量吸积率随时间的稳定性。我们在TW Hya的1169份存档高分辨率光学谱（1998–2022年获取）中测量了 veil（veiling，谱线填充） across the optical spectrum。随后利用覆盖Balmer跳变的26份流量定标谱将veiling转换为吸积率。由 excess continuum 测得的吸积率平均为 ~M~yr，呈高斯分布，FWHM为0.22 dex。由于热辐射改正的不确定性，该吸积率可能被低估至多1.5倍，另因未计入以谱线（尤其是Ly）形式逃出的吸积能量份额而再低估1.7倍。吸积光度与He线光度相关性良好，但与H和H光度相关性差。吸积率在数小时尺度上始终闪烁，但在更长时标上25年来保持稳定。这种变率水平与多数（而非全部）吸积年轻星的以往测量一致。
引用
@article{arxiv.2308.14590,
title = {Twenty-Five Years of Accretion onto the Classical T Tauri Star TW Hya},
author = {Gregory J. Herczeg and Yuguang Chen and Jean-Francois Donati and Andrea K. Dupree and Frederick M. Walter and Lynne A. Hillenbrand and Christopher M. Johns-Krull and Carlo F. Manara and Hans Moritz Guenther and Min Fang and P. Christian Schneider and Jeff A. Valenti and Silvia H. P. Alencar and Laura Venuti and Juan Manuel Alcala and Antonio Frasca and Nicole Arulanantham and Jeffrey L. Linsky and Jerome Bouvier and Nancy S. Brickhouse and Nuria Calvet and Catherine C. Espaillat and Justyn Campbell-White and John M. Carpenter and Seok-Jun Chang and Kelle L. Cruz and S. E. Dahm and Jochen Eisloeffel and Suzan Edwards and William J. Fischer and Zhen Guo and Thomas Henning and Tao Ji and Jesse Jose and Joel H. Kastner and Ralf Launhardt and David A. Principe and Conner E. Robinson and Javier Serna and Michal Siwak and Michael F. Sterzik and Shinsuke Takasao},
journal= {arXiv preprint arXiv:2308.14590},
year = {2023}
}
备注
Accepted by ApJ. 31 pages