Star-Disk Interactions in Multiband Photometric Monitoring of the Classical T Tauri Star GI Tau
文献类型:期刊论文
作者 | Michel, Raul5; Chiang, Po-Shih3; Fu, Jianning2; Jose, Jessy12; Herczeg, Gregory J.12; Guo, Zhen1,12; Altamirano, Liliana5,11; Castro, Angel5,11; Flores-Fajardo, Nahiely10,12; Prasert, Nikom6 |
刊名 | ASTROPHYSICAL JOURNAL
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出版日期 | 2018 |
卷号 | 852期号:1页码:56 |
关键词 | Stars: Pre-main Sequence Stars: Variables: t Tauri Herbig Ae/be |
ISSN号 | 0004-637X |
DOI | 10.3847/1538-4357/aa9e52 |
产权排序 | 8 |
文献子类 | Article |
英文摘要 | The variability of young stellar objects is mostly driven by star-disk interactions. In long-term photometric monitoring of the accreting T Tauri star GI Tau, we detect extinction events with typical depths of Delta V similar to 2.5 mag that last for days to months and often appear to occur stochastically. In 2014-2015, extinctions that repeated with a quasi-period of 21 days over several months are the first empirical evidence of slow warps predicted by magnetohydrodynamic simulations to form at a few stellar radii away from the central star. The reddening is consistent with R-V = 3.85 +/- 0.5 and, along with an absence of diffuse interstellar bands, indicates that some dust processing has occurred in the disk. The 2015-2016 multiband light curve includes variations in spot coverage, extinction, and accretion, each of which results in different traces in color-magnitude diagrams. This light curve is initially dominated by a month-long extinction event and a return to the unocculted brightness. The subsequent light curve then features spot modulation with a 7.03 day period, punctuated by brief, randomly spaced extinction events. The accretion rate measured from U-band photometry ranges from 1.3 x 10(-8) to 1.1 x 10(-10) M-circle dot yr(-1) (excluding the highest and lowest 5% of high- and low- accretion rate outliers), with an average of 4.7 x 10(-9) Me yr(-1). A total of 50% of the mass is accreted during bursts of >12.8 x 10(-9) M-circle dot yr(-1), which indicates limitations on analyses of disk evolution using single-epoch accretion rates. |
URL标识 | 查看原文 |
WOS关键词 | Diffuse Interstellar Bands ; Main-sequence Evolution ; Young Stars ; Magnetospheric Accretion ; Ux Orionis ; Vlba Determination ; Molecular Cloud ; Magnetic-fields ; Standard Stars ; Rotor-program |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
WOS记录号 | WOS:000419455800011 |
资助机构 | CAS |
源URL | [http://ir.xao.ac.cn/handle/45760611-7/1937] ![]() |
专题 | 新疆天文台_光学天文与技术应用研究室 光学天文与技术应用研究室_利用南山1米大视场望远镜(NOWT)观测数据的文章 |
通讯作者 | Guo, Zhen |
作者单位 | 1.Peking Univ, Sch Phys, Dept Astron, Yi He Yuan Lu 5, Beijing 100871, Peoples R China 2.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China 3.Natl Cent Univ, Grad Inst Astron, 300 Zhongda Rd, Taoyuan 32001, Taiwan 4.Crimean Astrophys Observ, Pos Nauchnyi 298409, Crimea, Russia 5.Univ Nacl Autonoma Mexico, Inst Astron, Apartado Postal 877, Ensenada 22800, Baja California, Mexico 6.Natl Astron Res Inst Thailand, Chiang Mai 50200, Thailand 7.Xinjiang Astron Observ, Urumqi 830011, Xinjiang, Peoples R China 8.Indian Inst Astrophys, Bangalore 560034, Karnataka, India 9.Aryabhatta Res Inst Observat Sci, Manora Peak 263002, Nainital, India 10.Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Cd Univ, Ciudad De Mexico 04510, Mexico |
推荐引用方式 GB/T 7714 | Michel, Raul,Chiang, Po-Shih,Fu, Jianning,et al. Star-Disk Interactions in Multiband Photometric Monitoring of the Classical T Tauri Star GI Tau[J]. ASTROPHYSICAL JOURNAL,2018,852(1):56. |
APA | Michel, Raul.,Chiang, Po-Shih.,Fu, Jianning.,Jose, Jessy.,Herczeg, Gregory J..,...&Grankin, Konstantin.(2018).Star-Disk Interactions in Multiband Photometric Monitoring of the Classical T Tauri Star GI Tau.ASTROPHYSICAL JOURNAL,852(1),56. |
MLA | Michel, Raul,et al."Star-Disk Interactions in Multiband Photometric Monitoring of the Classical T Tauri Star GI Tau".ASTROPHYSICAL JOURNAL 852.1(2018):56. |
入库方式: OAI收割
来源:新疆天文台
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