期刊
ASTRONOMICAL JOURNAL
卷 160, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/1538-3881/ab93be
关键词
-
资金
- NASA Keck PI Data Awards
- National Science Foundation [AST-1636624, AST-1518081]
- W. M. Keck Foundation
We present results from adaptive optics imaging of the T Tauri triple system obtained at the Keck and Gemini Observatories in 2015-2019. We fit the orbital motion of T Tau Sb relative to Sa and model the astrometric motion of their center of mass relative to T Tau N. Using the distance measured by Gala, we derived dynamical masses of M-Sa = 2.05 +/- 0.14 M-circle dot and M-sb = 0.43 +/- 0.06 M-circle dot. The precision in the masses is expected to improve with continued observations that map the motion through a complete orbital period; this is particularly important as the system approaches periastron passage in 2023. Based on published properties and recent evolutionary tracks, we estimate a mass of similar to 2 M-circle dot for T Tau N, suggesting that T Tau N is similar in mass to T Tau Sa. Narrowband infrared photometry shows that T Tau N remained relatively constant between late 2017 and early 2019 with an average value of K = 5.54 +/- 0.07 mag. Using T Tau N to calibrate relative flux measurements since 2015, we found that T Tau Sa varied dramatically between 7.0 and 8.8 mag in the K band over timescales of a few months, while T Tau Sb faded steadily from 8.5 to 11.1 mag in the K band. Over the 27 yr orbital period of the T Tau S binary, both components have shown 3-4 mag of variability in the K band, relative to T Tau N.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据