Dynamics of wind and the dusty environments in the accreting T Tauri stars RY Tauri and SU Aurigae

DOI: 
10.1093/mnras/sty3066
Publication date: 
01/02/2019
Main author: 
Petrov, P. P.
IAA authors: 
Fernandez, M.
Authors: 
Petrov, P. P.;Grankin, K. N.;Gameiro, J. F.;Artemenko, S. A.;Babina, E. V.;Albuquerque, R. M. G. de;Djupvik, A. A.;Gahm, G. F.;Shenavrin, V. I.;Irsmambetova, T. R.;Fernandez, M.;Mkrtichian, D. E.;Gorda, S. Yu
Journal: 
Monthly Notices of the Royal Astronomical Society
Refereed: 
Yes
Publication type: 
Article
Volume: 
483
Pages: 
132-146
Abstract: 
Classical T Tauri stars with ages of less than 10 Myr possess accretion discs. Magnetohydrodynamic processes at the boundary between the disc and the stellar magnetosphere control the accretion and ejections gas flows. We carried out a long series of simultaneous spectroscopic and photometric observations of the classical T Tauri stars, RY Tauri and SU Aurigae, with the aim to quantify the accretion and outflow dynamics at time-scales from days to years. It is shown that dust in the disc wind is the main source of photometric variability of these stars. In RY Tau, we observed a new effect: during events of enhanced outflow, the circumstellar extinction becomes lower. The characteristic time of changes in outflow velocity and stellar brightness indicates that the obscuring dust is near the star. The outflow activity in both stars is changing on a time-scale of years. Periods of quiescence in the variability of the Hα profile were observed during the 2015-2016 period in RY Tau and during the 2016-2017 period in SU Aur. We interpret these findings in the framework of the magnetospheric accretion model, and we discuss how the global stellar magnetic field can influence the long-term variations of the outflow activity.
Database: 
ADS
SCOPUS
URL: 
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85068359712&doi=10.1093%2fmnras%2fsty3066&partnerID=40&md5=467890b3ab226d5731db6e98a483fd3e
ADS Bibcode: 
2019MNRAS.483..132P
Keywords: 
line: profiles;stars: individual: RY Tau;stars: individual: SU Aur;stars: variables: T Tauri;Herbig Ae/Be;stars: winds;outflows;Astrophysics - Solar and Stellar Astrophysics