Magnetic fields in PMS stars: HARPS spectropolarimetry of sharp-lined Herbig Ae stars

Herbig Ae/Be-type stars are analogs of T Tauri stars in the higher mass 
range. Spectropolarimetric studies involving sharp-lined Herbig Ae stars 
appear to be a promising approach for the detection of their magnetic fields. 
We report the results of our HARPS high-resolution spectropolarimetric 
analysis of four Herbig Ae stars with low v sin i values: HD 101412, 
HD 104237, HD 190073, and PDS 2. The role of contamination by the surrounding 
warm  circumstellar matter for the appearance of Zeeman features is discussed 
for the first time. 




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