Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.295..781u&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 295, Issue 4, pp. 781-798.
Astronomy and Astrophysics
Astronomy
28
Stars: Imaging, Stars: Magnetic Fields, Stars: Individual: Df Tau, Stars: Pre-Main-Sequence
Scientific paper
We have mapped surface inhomogeneities on the classical T Tauri star DF Tau, using the Lii doublet at 670.8 nm, the Cai lines at 612.2 nm and 643.9 nm and a calcium and iron blend at 646.3 nm. We find compelling evidence that there are hotspots with temperatures of more than 5000 K. Two of the hotspots produce line-profile deformations that can be traced as they move through the cross-correlated profiles. When one of the hotspots crosses the stellar disc, redshifted absorption components appear in the Na D lines. As these redshifted absorption features are usually tracers for mass-infall we interpret this hotspot as an accretion shock close to the stellar surface. Parts of the surface of DF Tau are covered with a hot chromosphere that is visible in the Caii infrared triplet lines and the narrow component of Hei. We find no correlation between the veiling and the lines that originate from the hot chromosphere, suggesting that the veiling and the chromospheric emission are produced in physically distinct regions.
Collier Cameron Andrew
Guenther Eike E.
Unruh Yvonne C.
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