Volume 406, Number 2, August I 2003
|Page(s)||703 - 707|
|Section||Stellar structure and evolution|
|Published online||17 November 2003|
Resolved polarization changes across Hα in the classical T Tauri star RY Tauri
Imperial College of Science, Technology & Medicine, Blackett Laboratory, Prince Consort Road, London, SW7 2BZ, UK
2 School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL, UK
3 The Department of Physics and Astronomy, E C Stoner Building, Leeds, LS2 9JT, UK
Corresponding author: J. S. Vink, firstname.lastname@example.org
Accepted: 3 June 2003
We present linear Hα spectropolarimetry of the classical T Tauri star RY Tau. A change in the polarization percentage and position angle across Hα is detected, which suggests that line photons are scattered in a rotating disc. We derive the position angle from the slope of the loop in the diagram and find it to be 146 ± 3o. This is perpendicular to the position angle of the disc of 48 ± 5o as deduced from millimeter imaging by Koerner & Sargent ([CITE]). This finding is consistent, as scattering off the imaged millimeter disc is expected to yield a polarization signature in a direction that is rotated by 90o from this disc. The observed spectropolarimetric behaviour of RY Tau is reminiscent of that seen in a large group of Herbig Ae stars, suggesting a common circumstellar origin of the polarized photons.
Key words: stars: formation / stars: pre-main sequence / stars: individual: RY Tau / stars: circumstellar matter / techniques: polarimetric
© ESO, 2003
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.