Stable and Unstable Regimes of Mass Accretion onto RW Aur A - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles The Astrophysical Journal Year : 2016

Stable and Unstable Regimes of Mass Accretion onto RW Aur A

Michihiro Takami
Yu-Jie Wei
  • Function : Author
Mei-Yin Chou
  • Function : Author
Jennifer L. Karr
  • Function : Author
Tracy L. Beck
  • Function : Author
Wen-Ping Chen
  • Function : Author
Ryuichi Kurosawa
  • Function : Author
Misato Fukagawa
Marc White
  • Function : Author
Roberto Galván-Madrid
  • Function : Author
Hauyu Baobab Liu
  • Function : Author
Tae-Soo Pyo


We present monitoring observations of the active T Tauri star RW Aur, from 2010 October to 2015 January, using optical high-resolution (R ≥ 10,000) spectroscopy with Canada-France-Hawaii Telescope/ESPaDOnS. Optical photometry in the literature shows bright, stable fluxes over most of this period, with lower fluxes (by 2-3 mag) in 2010 and 2014. In the bright period our spectra show clear photospheric absorption, complicated variation in the Ca II λ8542 emission profile shapes, and a large variation in redshifted absorption in the O I λλ7772 and 8446 and He I λ5876 lines, suggesting unstable mass accretion during this period. In contrast, these line profiles are relatively uniform during the faint periods, suggesting stable mass accretion. During the faint periods, the photospheric absorption lines are absent or marginal, and the averaged Li I profile shows redshifted absorption due to an inflow. We discuss (1) occultation by circumstellar material or a companion and (2) changes in the activity of mass accretion to explain the above results, together with near-infrared and X-ray observations from 2011 to 2015. Neither scenario can simply explain all the observed trends, and more theoretical work is needed to further investigate their feasibilities.

Dates and versions

insu-03634272 , version 1 (07-04-2022)



Michihiro Takami, Yu-Jie Wei, Mei-Yin Chou, Jennifer L. Karr, Tracy L. Beck, et al.. Stable and Unstable Regimes of Mass Accretion onto RW Aur A. The Astrophysical Journal, 2016, 820, ⟨10.3847/0004-637X/820/2/139⟩. ⟨insu-03634272⟩
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