Proceedings of the International Astronomical Union

Contributed Papers

Chemical spots and their dynamical evolution on HgMn stars

Heidi Korhonena1, Swetlana Hubriga2, Maryline Briqueta3, Federico Gonzáleza4 and Igor Savanova5

a1 European Southern Observatory, Karl-Schwarzschild-Str 2, D-85748, Garching bei München, Germany email:

a2 Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany

a3 Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium

a4 Instituto de Ciencias Astronomicas, de la Tierra, y del Espacio (ICATE), 5400 San Juan, Argentina

a5 Institute of Astronomy, Russian Academy of Sciences, Pyatnitskaya 48, Moscow 119017, Russia


Our recent studies of late B-type stars with HgMn peculiarity revealed for the first time the presence of fast dynamical evolution of chemical spots on their surfaces. These observations suggest a hitherto unknown physical process operating in the stars with radiative outer envelopes. Furthermore, we have also discovered existence of magnetic fields on these stars that have up to now been thought to be non-magnetic. Here we will discuss the dynamical spot evolution on HD 11753 and our new results on magnetic fields on AR Aur.

(Online publication August 26 2011)


  • Stars: atmospheres;
  • chemically peculiar;
  • early-type;
  • magnetic fields;
  • spots